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Genesis 6:1

“The Corruption of Mankind”Genesis 6:1–4
King James Version
And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them,

Bible text: King James Version (1769 Blayney text) · Public domain

KJV (with Strong's)
And it came to pass, when men H120 began H2490 to multiply H7231 on H5921 the face H6440 of the earth H127, and daughters H1323 were born H3205 unto them,

Bible text: King James Version with Strong's numbers · Public domain

Berean Standard Bible
Now when men began to multiply on the face of the earth and daughters were born to them,

Bible text: Berean Standard Bible · Public domain

American Standard Version
And it came to pass, when men began to multiply on the face of the ground, and daughters were born unto them,

Bible text: American Standard Version (1901) · Public domain

World English Bible Messianic
When men began to multiply on the surface of the ground, and daughters were born to them,

Bible text: World English Bible, Messianic edition · Public domain

Geneva Bible (1599)
So when men began to be multiplied vpon the earth, and there were daughters borne vnto them,

Bible text: Geneva Bible (1599) · Public domain

Young's Literal Translation
And it cometh to pass that mankind have begun to multiply on the face of the ground, and daughters have been born to them,

Bible text: Young's Literal Translation · Public domain

King James Version — Interlinear
11 Hebrew words
  1. וַיְהִיvay·Hiand it wasH1961Conj-w ¦ V-Qal-ConsecImperf-3msVerb Qal Consecutive Imperfect 3rd Singular Masculineוַandיְהִיit was
  2. כִּיkithatH3588PrtParticle Conditional
  3. הֵחֵלhe·Chel[it] beganH2490V-Hiphil-Perf-3msVerb Hiphil Perfect 3rd Singular Masculine
  4. הָאָדָםha·'a·Dam[the] humankindH120Art ¦ N-msNoun Singular Masculine Absoluteהָ[the]אָדָםhumankind
  5. לָרֹבla·Roto become numerousH7231Prep-l ¦ V-Qal-InfVerb Qal Infinitive Constructלָtoרֹבbecome numerous
  6. עַל'alonH5921PrepPreposition
  7. פְּנֵיpe·Nei[the] surface ofH6440N-mpcNoun Plural Masculine Construct
  8. הָאֲדָמָהha·'a·da·Mahthe groundH127Art ¦ N-fsNoun Singular Feminine Absoluteהָtheאֲדָמָהground
  9. וּבָנוֹתu·va·Notand daughtersH1323Conj-w ¦ N-fpNoun Plural Feminine Absoluteוּandבָנוֹתdaughters
  10. יֻלְּדוּyu·le·Duthey were bornH3205V-Pual-Perf-3cpVerb Pual Perfect 3rd Plural common gender
  11. לָהֶםla·Hemto [the] themPrep-l ¦ 3mpSuffix Personal 3rd Plural Masculineלָto [the]הֶםthem
English is a literal word-by-word gloss of the Hebrew, not the KJV's wording. Why?

This is the original text the KJV's translators worked from — each Hebrew word with its own literal English meaning in this verse, prepared by scholars at Tyndale House, Cambridge. The KJV translates whole sentences, not word by word, so its wording differs: one Hebrew word can become several English words, and the KJV may choose “the LORD” where the gloss reads “Yahweh”. Both are faithful — they answer different questions. For the KJV's own rendering, switch to the KJV text.

Words in [ ] are added by the English.

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This verse

As people multiply across the earth and daughters are born to them, God’s blessing of Genesis 1:28 is coming true, and this growing world becomes the setting for the corruption that follows.

“And it came to pass,”

A new event begins after the long list of Genesis 5, and it leads to the flood.

“when men began to multiply on the face of the earth,”

The blessing given at creation is still at work after the fall, and humanity is filling the earth as God said it would.

“and daughters were born unto them,”

The daughters are mentioned because the next verse turns on them.

The Sons of God and the Daughters of Men

Genesis 6:1–4

Summary

Genesis 5 traced the line from Adam to Noah. Chapter 6 opens on a growing world. Men multiply on the earth and daughters are born to them, and then “the sons of God” see that the daughters of men are fair and take wives of all they choose. The LORD answers that his spirit will not always strive with man, because man is flesh, and he sets a limit of a hundred and twenty years. Giants are on the earth in those days, and the children of these unions become “mighty men which were of old, men of renown.” These four verses open the account of the wickedness God judged in the flood. They show how seriously God takes sin, and how long he waits before he judges it.

A growing world and a blessing fulfilled

“And it came to pass” (vayhi) is the phrase Hebrew narrative uses to open a new event, and here it carries the story on from the genealogies of Genesis 5 to the years before the flood. The word for men, ʼâdâm, comes from a root meaning ruddy and stands for humanity as a whole, women as well as men. “Began” is châlal, which in this form simply means to begin and is used of starting any action. The verb for multiply, râbab, means to become many, to increase greatly in number.

So the first thing this verse records is God’s own blessing coming true. He had told the first man and woman to “Be fruitful, and multiply, and replenish the earth” (Genesis 1:28), and now people are spreading “on the face of the earth.” Growth in numbers is good, and it is his gift. What follows shows that a world can grow in numbers while it falls away from God. The more people there were, the further sin spread, until “GOD saw that the wickedness of man was great in the earth” (Genesis 6:5). Paul traces that spread to its source: “as by one man sin entered into the world, and death by sin; and so death passed upon all men” (Romans 5:12).

The verse adds that “daughters were born unto them.” Sons were born too, and the daughters are named because they are the “daughters of men” of the next verse, where the trouble begins. The word bath, daughter, is the feminine of bên, son, and Strong’s derives it from bânâh, to build, since children build up a family.

Who were the sons of God?

Scripture names them only as “the sons of God”, bên joined to ʼĕlôhîym (in Hebrew b’nei ha’Elohim), and faithful believers differ on who they were. The word bên means son, and it is often used of one who belongs to a group or shares in its nature. ʼĕlôhîym is the usual word for God. It is plural in form, and when it names the true God it is a plural of majesty. The same word can also mean “gods” or “mighty ones,” and it is used of angels and even of human judges. The verse leaves the identity open, and three readings are held.

Heavenly beings who left their place

The phrase “sons of God” comes in Job 1:6, where “the sons of God came to present themselves before the LORD,” and there they are heavenly beings. On this reading the sons of God in Genesis 6 are angels who sinned by leaving their own domain and taking human wives, and the giants of verse 4 were their children. It is the older of the readings, and it is found in ancient Jewish tradition, including the Book of Enoch. Those who hold it point to verse 4, which says the sons of God “came in unto the daughters of men,” and to two New Testament passages. Jude speaks of “the angels which kept not their first estate, but left their own habitation” (Jude 1:6–7). Peter speaks of “the angels that sinned,” and in the next verse of God “bringing in the flood upon the world of the ungodly” (2 Peter 2:4–5). On this reading the struggle against evil in these days reached beyond the earth, as the promise of enmity between the serpent’s seed and the woman’s seed already foretold (Genesis 3:15), and as Paul’s words on wrestling against spiritual wickedness in high places describe (Ephesians 6:12).

The godly line of Seth

Other believers hold that the sons of God were the godly line of Seth, the people who belonged to the LORD, and that the daughters of men were women of the ungodly line of Cain, whose descendants were marked by violence and disregard for God. On this reading the sin is a believing people marrying without regard to the LORD, and the result is a falling away from faith that spread across the world. God later warned Israel against the same thing when he forbade marriage with the nations, “For they will turn away thy son from following me” (Deuteronomy 7:3–4), and Paul writes, “Be ye not unequally yoked together with unbelievers” (2 Corinthians 6:14).

Powerful rulers

A third reading takes the sons of God to be powerful human rulers or nobles who took many wives and set up oppressive dynasties. ʼĕlôhîym can be used of those who judge and rule, and the “mighty men” of verse 4 would then be the sons of these rulers.

What every reading holds

On any of these readings, the verse reports plainly what these men did. They “saw,” they found the daughters of men “fair,” and they “took them wives of all which they chose.” The word for fair is ṭôwb, good in the widest sense, used here of beauty. The verb lâqach means to take, and it is the ordinary word for taking a wife. Their choice was made by sight, and the LORD has no part in it. The pattern is the one from Eden, where the woman saw that the tree was good and pleasant to the eyes, and took (Genesis 3:6).

All three readings agree that a serious breach of God’s order took place here, and that it belongs to the wickedness that grieved him and brought the flood (Genesis 6:5–7). It came in a world already marked by the fall of Genesis 3 and by Cain’s murder of Abel in Genesis 4, and the rest of Genesis 6 follows it to the ark.

The LORD’s spirit and man’s flesh

Verse 3 brings in the covenant name, “the LORD,” Yᵉhôvâh, the self-existent and eternal God who binds himself to his people. What he says is a decree. “My spirit” is rûwach, the word for wind, breath and spirit, here the Spirit of God. “Strive” is dîyn, a verb that means to judge, to contend or to rule. God’s Spirit had been contending with man, restraining his evil and warning him, and God declares that this will come to an end. Some render the verb “abide,” so that God’s Spirit will remain in man only for a time. On either rendering, God sets a limit to his patience with a people set on rebellion.

The reason he gives is “for that he also is flesh.” The word bâsâr means flesh, body, kin or mortal creature, and it is used of man over against God as frail and erring. Man is mortal and weak, and in his rebellion he stands against God’s Spirit. A psalm holds the same thought when it tells of God’s mercy to Israel in the wilderness: “For he remembered that they were but flesh; a wind that passeth away, and cometh not again” (Psalm 78:39). Paul writes of the flesh (Greek sarx) as a state in which man is unable to please God: “So then they that are in the flesh cannot please God” (Romans 8:8).

The Spirit still contends with the world. Jesus said of the Comforter, “when he is come, he will reprove the world of sin, and of righteousness, and of judgment” (John 16:8). He calls people to repentance and faith, and a heart that goes on refusing him grows harder.

What are the hundred and twenty years?

The hundred and twenty years are the time God sets before his judgment, and believers differ on what that time measures.

  • A season of grace before the flood. Many hold that the years count down to the flood itself. On this reading God gave the world a hundred and twenty years as a last opportunity to repent, years in which Noah built the ark and warned his generation, the man Peter calls “a preacher of righteousness.” Peter speaks of this patience when he says that “the longsuffering of God waited in the days of Noah, while the ark was a preparing” (1 Peter 3:20).
  • A new limit to a man’s life. Others take “his days” as the span of a single life, which God now sets at a hundred and twenty years, after the long lives recorded in Genesis 5.

On both readings the verse shows God holding back his judgment and giving time. “Yet” opens the last clause, and with it mercy comes into the sentence. He is the God of whom the psalm says, “The LORD is gracious, and full of compassion; slow to anger, and of great mercy” (Psalm 145:8).

Who were the giants?

The giants were the Nephilim, people of great strength and fame who lived on the earth in the days before the flood. The KJV’s “giants” translates nᵉphîyl (plural Nephilim). Strong’s ties the word to a root meaning to fall and gives it the sense of “a feller,” a bully or tyrant, and in common use a giant. Some render it “fallen ones” or “those who cause to fall,” though its origin is uncertain. The word comes again in Numbers 13:33, linked there with the sons of Anak: “there we saw the giants, the sons of Anak, which come of the giants.” By then the Nephilim had become a byword for size and terror.

“In those days; and also after that” places them both before these unions and after them. Either the Nephilim were already on the earth when the sons of God came in to the daughters of men, or the mighty men born of those unions belonged to the same race of giants. Believers who take the sons of God as angels read the Nephilim as their children, and those who take them as men read the Nephilim as men of great size and violence. The verse is brief, and the uncertainty about both “sons of God” and “Nephilim” is why it is among the most discussed verses in the Old Testament.

Mighty men of renown

The children of these unions “became mighty men which were of old, men of renown.” The word for mighty men is gibbôwr (plural gibborim), a powerful man or warrior, and by extension a tyrant. “Of old” gives them the standing of ancient legend, and “men of renown” (anshei ha-shem) means they were famous. In an age that God was about to judge for its violence and evil, their fame was most likely fame for power and oppression. The nations later told tales of heroes who were half divine. Genesis sets these men of renown within the corruption that the flood would judge, far from the good world God made in Genesis 1.

The days of Noah and the Son of God

Jesus pointed back to this age when he spoke of his own return: “But as the days of Noe were, so shall also the coming of the Son of man be” (Matthew 24:37–39, Luke 17:26–27). People went on with their lives, unprepared for the judgment that came on them, and the world is the same now.

The sons of God in Genesis 6 took what they saw and wanted. The Son of God came to give. He “took part” of flesh and blood “that through death he might destroy him that had the power of death, that is, the devil” (Hebrews 2:14). He is “the Lamb of God, which taketh away the sin of the world” (John 1:29), and in him God’s love reaches the very people whose flesh deserved judgment, “For God so loved the world, that he gave his only begotten Son” (John 3:16). Noah and his family were kept safe through the flood by God’s grace, and Christ is the true ark for all who shelter in him.

Genesis 6:3 sets man’s flesh against God’s Spirit, and Jesus answers that same divide. “That which is born of the flesh is flesh; and that which is born of the Spirit is spirit” (John 3:5–6). To those born again he promised the Comforter, “that he may abide with you for ever; Even the Spirit of truth” (John 14:16–17). They now walk “not after the flesh, but after the Spirit” (Romans 8:4), and “if any man be in Christ, he is a new creature” (2 Corinthians 5:17).

God’s patience in a corrupt age

These verses show God watching the world he made good, seeing every choice its people make, and grieved by what they become. They also show him waiting. Before he judged, he spoke his limit aloud and gave a hundred and twenty years, and his longsuffering waited while the ark was built.

The passage tells the truth about us as well. Man is flesh, frail and erring, and growth in numbers, strength or fame leaves him flesh still. The mighty men had renown, and the flood ended it. What changes flesh is the Spirit, who gives new birth to those who believe and stays with them for ever. The God who said “My spirit shall not always strive with man” is the same God who “commendeth his love toward us, in that, while we were yet sinners, Christ died for us” (Romans 5:8). His patience is real, and so is its limit, and the time he gives is the time to turn to him.

Last revised

Public-domain commentary

Matthew Henry

From his Commentary on the Whole Bible. Henry wrote on whole passages, and this entry covers Genesis 6:1–2.

1662–1714 · 2 verses
Passage under commentGenesis 6:1–2

For the glory of God's justice, and for warning to a wicked world, before the history of the ruin of the old world, we have a full account of its degeneracy, its apostasy from God and rebellion against him. The destroying of it was an act, not of an absolute sovereignty, but of necessary justice, for the maintaining of the honour of God's government. Now here we have an account of two things which occasioned the wickedness of the old world: - 1. The increase of mankind: Men began to multiply upon the face of the earth. This was the effect of the blessing (Genesis 1:28), and yet man's corruption so abused and perverted this blessing that it was turned into a curse. Thus sin takes occasion by the mercies of God to be the more exceedingly sinful. Proverbs 29:16, When the wicked are multiplied, transgression increaseth. The more sinners the more sin; and the multitude of offenders emboldens men. Infectious diseases are most destructive in populous cities; and sin is a spreading leprosy. Thus in the New Testament church, when the number of the disciples was multiplied, there arose a murmuring (Acts 6:1), and we read of a nation that was multiplied, not to the increase of their joy, Isaiah 9:3. Numerous families need to be well-governed, lest they become wicked families. 2. Mixed marriages (Genesis 6:2): The sons of God (that is, the professors of religion, who were called by the name of the Lord, and called upon that name), married the daughters of men, that is, those that were profane, and strangers to God and godliness. The posterity of Seth did not keep by themselves, as they ought to have done, both for the preservation of their own purity and in detestation of the apostasy. They intermingled themselves with the excommunicated race of Cain: They took them wives of all that they chose. But what was amiss in these marriages? (1.) They chose only by the eye: They saw that they were fair, which was all they looked at. (2.) They followed the choice which their own corrupt affections made: they took all that they chose, without advice and consideration. But, (3.) That which proved of such bad consequence to them was that they married strange wives, were unequally yoked with unbelievers, 2 Corinthians 6:14. This was forbidden to Israel, Deuteronomy 7:3, Deuteronomy 7:4. It was the unhappy occasion of Solomon's apostasy (1 Kings 11:1-4), and was of bad consequence to the Jews after their return out of Babylon, Ezra 9:1, Ezra 9:2. Note, Professors of religion, in marrying both themselves and their children, should make conscience of keeping within the bounds of profession. The bad will sooner debauch the good than the good reform the bad. Those that profess themselves the children of God must not marry without his consent, which they have not if they join in affinity with his enemies.

Historical interpretation

Seven Centuries of Reception

19 surviving comments on this verse. Each one is dated, so this reads as a timeline rather than a list.

19 quotes · AD 50–735
Ante-NicenePost-NiceneEarly Medieval
100200300400500600700

Select a marker to jump to its quote. Markers stagger vertically where authors wrote within a few decades of each other.

d. AD 50Philo of AlexandriaAnte-NiceneSourceON THE GIANTS
"And it came to pass when there began to be many men upon the earth, that daughters also were born to Them." [Genesis 6:1] I think it here worth while to raise the question why, after the birth of Noah and his sons, our race increased to a degree of great populousness. But, perhaps, it is not difficult to explain the cause of this; for it always happens if anything appears to be rare that its contrary is found exceedingly numerous. (2) Therefore, the good disposition of one displays the evil disposition of myriads, and the fact of those things which are done in accordance with art, and science, and virtue, and beauty, being few, shows how incalculable a number of things devoid of art, and of science, and of justice, and, in short, utterly worthless, lie concealed beneath. (3) Do you not see that in the universe, also, the sun, being one body, by his shining forth dissipates the thick and dense darkness which is shed over earth and sea? With great propriety, therefore, the generation of the just Noah and his sons is represented as bringing into existence a great number of unjust persons; for it is by the contrary that it is especially the nature of contraries to be known. (4) And no unjust man at any time implants a masculine generation in the soul, but such, being unmanly, and broken, and effeminate in their minds, do naturally become the parents of female children; having planted no tree of virtue, the fruit of which must of necessity have been beautiful and salutary, but only trees of wickedness and of the passions, the shoots of which are womanlike. (5) On account of which fact these men are said to have become the fathers of daughters, and that no one of them is said to have begotten a son; for since the just Noah had male children, as being a man who followed reason, perfect, and upright, and masculine, so by this very fact the injustice of the multitude is proved to be altogether the parent of female children. For it is impossible that the same things should be born of opposite parents; but they must necessarily have an opposite offspring.
For many angels of God accompanied with women, and begat sons that proved unjust, and despisers of all that was good, on account of the confidence they had in their own strength; for the tradition is, that these men did what resembled the acts of those whom the Grecians call giants. But Noah was very uneasy at what they did; and being displeased at their conduct, persuaded them to change their dispositions and their acts for the better: but seeing they did not yield to him, but were slaves to their wicked pleasures, he was afraid they would kill him, together with his wife and children, and those they had married; so he departed out of that land.
God, when He had made the whole world, and subjected things earthly to man, and arranged the heavenly elements for the increase of fruits and rotation of the seasons, and appointed this divine law-for these things also He evidently made for man-committed the care of men and of all things under heaven to angels whom He appointed over them. But the angels transgressed this appointment, and were captivated by love of women, and begat children who are those that are called demons; and besides, they afterwards subdued the human race to themselves, partly by magical writings, and partly by fears and the punishments they occasioned, and partly by teaching them to offer sacrifices, and incense, and libations, of which things they stood in need after they were enslaved by lustful passions; and among men they sowed murders, wars, adulteries, intemperate deeds, and all wickedness. Whence also the poets and mythologists, not knowing that it was the angels and those demons who had been begotten by them that did these things to men, and women, and cities, and nations, which they related, ascribed them to god himself, and to those who were accounted to be his very offspring, and to the offspring of those who were called his brother), Neptune and Pluto, and to the children again of these their offspring. For whatever name each of the angels had given to himself and his children, by that name they called them.
And for a very long while wickedness extended and spread, and reached and laid hold upon the whole race of mankind, until a very small seed of righteousness remained among them and illicit unions took place upon the earth, since angels were united with the daughters of the race of mankind; and they bore to them sons who for their exceeding greatness were called giants. And the angels brought as presents to their wives teachings of wickedness, in that they brought them the virtues of roots and herbs, dyeing in colors and cosmetics, the discovery of rare substances, love-potions, aversions, amours, concupiscence, constraints of love, spells of bewitchment, and all sorcery and idolatry hateful to God; by the entry of which things into the world evil extended and spread, while righteousness was diminished and enfeebled. Until judgment came upon the world from God by means of a flood, in the tenth generation from the first-formed (man); Noah alone being found righteous.
Since the Son of God is always one and the same, He gives to those who believe on Him a well of water [springing up] to eternal life, but He causes the unfruitful fig-tree immediately to dry up; and in the days of Noah He justly brought on the deluge for the purpose of extinguishing that most infamous race of men then existent, who could not bring forth fruit to God, since the angels that sinned had commingled with them, and [acted as He did] in order that He might put a check upon the sins of these men, but [that at the same time] He might preserve the archetype, the formation of Adam. And it was He who rained fire and brimstone from heaven, in the days of Lot, upon Sodom and Gomorrah, “an example of the righteous judgment of God,” that all may know, “that every tree that bringeth not forth good fruit shall be cut down, and cast into the fire.”
To which also we shall add, that the angels who had obtained the superior rank, having sunk into pleasures, told to the women the secrets which had come to their knowledge; while the rest of the angels concealed them, or rather, kept them against the coming of the Lord.
The mind is led astray by pleasure, and the virgin center of the mind, if not disciplined by the Word, degenerates into licentiousness and reaps disintegration as reward for its transgressions. An example of this for you is the angels who forsook the beauty of God for perishable beauty and fell as far as heaven is from the earth.
d. AD 220TertullianAnte-NiceneSourceOn Prayer
What is "every woman, but woman of every age, of every rank, of every condition? By saying" every" he excepts nought of womanhood, just as he excepts nought of manhood either from not being covered; for just so he says, "Every man." As, then, in the masculine sex, under the name of" man" even the" youth" is forbidden to be veiled; so, too, in the feminine, under the name of "woman," even the "virgin" is bidden to be veiled. Equally in each sex let the younger age follow the discipline of the elder; or else let the male "virgins," too, be veiled, if the female virgins withal are not veiled, because they are not mentioned by name. Let "man" and "youth" be different, if "woman" and "virgin" are different. For indeed it is "on account of the angels" that he saith women must be veiled, because on account of "the daughters of men" angels revolted from God.
For they, withal, who instituted them are assigned, under condemnation, to the penalty of death — those angels, to wit, who rushed from heaven on the daughters of men; so that this ignominy also attaches to woman. For when to an age much more ignorant (than ours) they had disclosed certain well-concealed material substances, and several not well-revealed scientific arts — if it is true that they had laid bare the operations of metallurgy, and had divulged the natural properties of herbs, and had promulgated the powers of enchantments, and had traced out every curious art, even to the interpretation of the stars — they conferred properly and as it were peculiarly upon women that instrumental mean of womanly ostentation, the radiances of jewels wherewith necklaces are variegated, and the circlets of gold wherewith the arms are compressed, and the medicaments of orchil with which wools are colored, and that black powder itself wherewith the eyelids and eyelashes are made prominent. What is the quality of these things may be declared meantime, even at this point, from the quality and condition of their teachers: in that sinners could never have either shown or supplied anything conducive to integrity, unlawful lovers anything conducive to chastity, renegade spirits anything conducive to the fear of God. If (these things) are to be called teachings, ill masters must of necessity have taught ill; if as wages of lust, there is nothing base of which the wages are honourable. But why was it of so much importance to show these things as well as to confer them? Was it that women, without material causes of splendour, and without ingenious contrivances of grace, could not please men, who, while still unadorned, and uncouth and — so to say — crude and rude, had moved (the mind of) angels? Or was it that the lovers would appear sordid and — through gratuitous use — contumelious, if they had conferred no (compensating) gift on the women who had been enticed into connubial connection with them? But these questions admit of no calculation. Women who possessed angels (as husbands) could desire nothing more; they had, forsooth, made a grand match! Assuredly they who, of course, did sometimes think whence they had fallen, and, after the heated impulses of their lusts, looked up toward heaven, thus requited that very excellence of women, natural beauty, as (having proved) a cause of evil, in order that their good fortune might profit them nothing; but that, being turned from simplicity and sincerity, they, together with (the angels) themselves, might become offensive to God. Sure they were that all ostentation, and ambition, and love of pleasing by carnal means, was displeasing to God. And these are the angels whom we are destined to judge: these are the angels whom in baptism we renounce: these, of course, are the reasons why they have deserved to be judged by man. What business, then, have their things with their judges? What commerce have they who are to condemn with them who are to be condemned? The same, I take it, as Christ has with Belial. With what consistency do we mount that (future) judgment-seat to pronounce sentence against those whose gifts we (now) seek after? For you too, (women as you are,) have the self-same angelic nature promised as your reward, the self-same sex as men: the self-same advancement to the dignity of judging, does (the Lord) promise you. Unless, then, we begin even here to pre-judge, by pre-condemning their things, which we are hereafter to condemn in themselves, they will rather judge and condemn us.
d. AD 240Julius Africanusas quoted by George Syncellus, AD 810Ante-NiceneSourceFragment 2
When men multiplied on the earth, the angels of heaven came together with the daughters of men. In some copies I found "the sons of God." What is meant by the Spirit, in my opinion, is that the descendants of Seth are called the sons of God on account of the righteous men and patriarchs who have sprung from him, even down to the Saviour Himself; but that the descendants of Cain are named the seed of men, as having nothing divine in them, on account of the wickedness of their race and the inequality of their nature, being a mixed people, and having stirred the indignation of God. But if it is thought that these refer to angels, we must take them to be those who deal with magic and jugglery, who taught the women the motions of the stars and the knowledge of things celestial, by whose power they conceived the giants as their children, by whom wickedness came to its height on the earth, until God decreed that the whole race of the living should perish in their impiety by the deluge.
But when they did nothing of this kind, but tried to make supplication to the evil daemons by a foul and licentious life and unseemly words, and by feeding on raw flesh, and rending victims asunder, and by human sacrifices, how was it even possible that doing such deeds, and pursuing practices pleasing to the wicked, they should be received as friends by the Supreme God, or by the divine Powers subject to Him, or by any good beings at all?

But in fact it is manifest to all that he who practises the things that are dear to the wicked can never be a friend of the good. So then it was not to gods, nor yet to good daemons, but only to the wicked, that those of whom I have spoken paid worship.

And this argument is still further confirmed by Plutarch, in the passage where he says that the mythical narratives told as concerning gods are certain tales about daemons, and the deeds of Giants and Titans celebrated in song among the Greeks are also stories about daemons, intended to suggest a new phase of thought.

Of this kind then perhaps were the statements in the Sacred Scripture concerning the giants before the flood, and those concerning their progenitors, of whom it is said, 'And when the angels of God saw the daughters of men that they were fair, they took unto them wives of all that they chose,' and of these were born 'the giants the men of renown which were of old.'

For one might say that these daemons are those giants, and that their spirits have been deified by the subsequent generations of men, and that their battles, and their quarrels among themselves, and their wars are the subjects of these legends that are told as of gods.
Again after these a third appeared: Noah who has received testimony as 'a righteous man in his generation.' And the following will be proofs of his righteousness. A great foulness and darkness of indescribable wickedness had overtaken the whole human race, and the giants talked of by every mouth were carrying on with ungodly and impious efforts their wars with God which are still so celebrated: and already the fathers of this their brood, whether they had sprung from some condition mightier than man's nature, or in whatever way endowed, are said to have begun the teaching of curious arts among men, and to have introduced devices of witchcraft and other mischievous sorcery into their life, so that the whole human race had fallen under one sentence of judgement with God.
He called the sons of Seth sons of God, those who, like the sons of Seth, had been called "the righteous people of God." The beautiful daughters of men whom they saw were the daughters of Cain who adorned themselves and became a snare to the eyes of the sons of Seth. Then Moses said, they took them wives of all which they chose.
d. AD 390Nemesius of EmesaPost-NiceneSourceON THE NATURE OF MAN 58
Of the incorporeal beings, only angels fell away, and not all of them, but some only, that inclined to things below and set their desire on things of earth, withdrawing themselves from their relations with things above, even from God.
d. AD 407John ChrysostomPost-NiceneSourceHomily 22 on Genesis
"Now, when the sons of God saw that the daughters of men were beautiful, they took wives for themselves from them all just as they were inclined." Let us study each expression of this statement closely so that nothing of what is hidden below the surface may pass us by. You see, there is need to make a careful study of this passage and confute the fanciful interpretations of those people whose every remark is made rashly - firstly, to repeat what they presume to say, and by demonstrating the absurdity of what is said by them to teach your good selves the true sense of Scripture so that you will not lend your ears idly to people uttering those blasphemies and presuming to speak in a way that brings their own persons into jeopardy. I mean, they claim that this remark is made not about human being but about angels; these (they say) he called sons of God. Let them demonstrate firstly where angels are called sons of God; they would not, however, be able to show this anywhere. While human beings are called sons of God, angels are nowhere so called. On the contrary, it speaks about angels in these terms: "He makes the winds his angels, fire and flame his ministers," whereas about human beings, "I said, You are gods," and again, "Sons have I begotten and raised," and again, "Israel my firstborn son" - but an angel is nowhere called son, or son of God. What in fact do they claim? To be sure, they really were angels, but because they fell into this lawless way, they lost their status...

Is it not a particular hallmark of folly to claim that angels descended to have intercourse with women, and that incorporeal nature of theirs was reduced to association with corporeal creatures? Or do you not hear the words of Christ about the being of angels, "At the resurrection they neither marry nor are given in marriage, but are like angels of God"? After all, it is not for that kind of incorporeal creature to ever feel the onset of desire. In response to these people we have to reach the same conclusion, that to admit this notion into one's mind is the height of absurdity.

We made the point before in teaching you that it is customary with Scripture to call human beings sons of God. So since these people took their origin from Seth and from his son named Enosh (the text, remember, saying, "He it was who hoped to invoke the name of the Lord God"), those descended from him in the future were called sons of God by Sacred Scripture for the reason of their imitation of the virtue of their ancestors up to his time. On the other hand, he gave the name sons of men to those born after Seth, the descendants of Cain and those taking their descent from him.
d. AD 435John CassianPost-NiceneSourceConference 8, CHAPTER XXI
As long then as there continued that separation of the lines between them, the seed of Seth, as it sprang from an excellent root, was by reason of its sanctity termed "angels of God," or as some copies have it "sons of God;" and on the contrary the others by reason of their own and their fathers' wickedness and their earthly deeds were termed "children of men." Though then there was up to this time that holy and salutary separation between them, yet after this the sons of Seth who were the sons of God saw the daughters of those who were born of the line of Cain, and inflamed with the desire for their beauty took to themselves from them wives who taught their husbands the wickedness of their fathers, and at once led them astray from their innate holiness and the single-mindedness of their forefathers...From these sons of Seth then and daughters of Cain, as we have said, there were I born still worse children who became mighty hunters, violent and most fierce men who were termed giants by reason of the size of their bodies and their cruelty and wickedness. For these first began to harass their neighbours and to practise pillaging among men, getting their living rather by rapine than by being contented with the sweat and labour of toil, and their wickedness increased to such a pitch that the world could only be purified by the flood and deluge.
That we rightly understand this passage is also very much confirmed by the interpretation of the other translators. Aquila says: 'When the sons of the gods saw the daughters of men'. On the other hand, instead of 'sons of the gods', Symmachus rendered the expression as 'sons of the rulers'. They called the descendants of Seth and of Enosh sons of the gods, or better, sons of the rulers, because of the piety and godliness which was in them, and because they could defeat all adversaries: while God, I suppose, in all likelihood came to their aid, and made known all around this pious and holy generation, which was not mixed with that other one, that is to say, with the descendants from Cain and, what is more, from Lamech.
d. AD 735BedeEarly MedievalSourceCommentary on Genesis (Hexaemeron)
And when men began to multiply on the earth and had daughters, the sons of God saw the daughters of men that they were fair; and they took wives for themselves of all whom they chose. "Men" means the offspring of Cain, who, turned away from the view of divine will, subjected their mind solely to human affairs: "sons of God", however, refers to those who were born from the lineage of Seth, who, following the example of their father's devotion, preserved with an inviolate mind the service they owed to God. By this distinction, the Lord in the Gospel also separated His disciples from the rest, saying, "Whom do men say that the Son of Man is?" (Matthew 16:13). And having received their answer, He said, "But who do you say that I am?" evidently wanting them to be understood as superior to men and to be counted among those of whom He Himself said: "I have said, You are gods; and all of you are children of the Most High" (Psalm 82:6). Some manuscripts have "angels of God" instead of "sons of God," which is obviously taken in the same sense. For the angels of God are rightly called righteous men, who according to the measure of their capacity strive to live an angelic life on earth: to such the Apostle says, "But you are not in the flesh, but in the Spirit" (Romans 8:9). And again: "For our conversation is in heaven" (Philippians 3:20). Therefore, it seems that the generation of the lineage of Seth, as long as it was not mingled with the offspring of Cain, preserved the norm of its chastity untainted; but after it fell into concupiscence and joined the cursed offspring of wicked women, it also began to share in the curse with the corrupted decency of its sober mind. Hence, in the law it is diligently and carefully commanded to the sons of Israel, not to intermarry with foreigners, because, it says, “his daughter will seduce your son to follow their gods” (Deuteronomy 7:4).
Source: Quotations drawn from early Church Fathers and historical Christian theologians (AD 100–1500). Some quotes address the surrounding passage context rather than this verse alone.

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