Bede

And the Lord said to Abraham: "You shall not call your wife Sarai, but Sarah, and I will bless her, and I will give you a son by her, whom I will bless, and he will become nations, and kings of peoples shall come from him. Here the promises about the calling of the gentiles in Isaac are more evident, that is, in the son of promise, which signifies grace, not nature, because a son is promised from an old man and a barren old woman. Although God also works in the natural course of procreation, where however the evident work of God is, with nature being corrupted and ceasing, grace is understood more evidently; and because this will happen not by generation, but by regeneration, therefore circumcision is now commanded. When a son was promised from Sarah, the names of the parents are also changed, everything resonates with newness, and the New Testament is foreshadowed in the Old. Sarai is interpreted as "My Princess," but Sarah as "Princess," and the reason for the change of the name is this: because she was previously called "My Princess," that is, the mother of one household only, but afterwards she is called "Princess" absolutely; for it follows:

He was ninety-nine years old when he circumcised the flesh of his foreskin, and Ishmael his son had completed thirteen years at the time of his circumcision. Therefore, Abraham was a hundred years old, and Ishmael was thirteen years old when they were circumcised: so that, after a year, when Isaac was born, Abraham was a hundred years old, and Ishmael was fourteen, that is, twice seven, years old? Indeed, in a great mystery: because evidently Isaac held the figure of the New Testament, and Ishmael of the Old Testament. For Isaac, when he was born, his father was a hundred years old, to signify that the grace of the New Testament would bring the children of his promise to the inheritance of the heavenly kingdom. Indeed, the number one hundred, as has often been said, in the arithmetical count, passes from the left to the right, and our heavenly mother Jerusalem is rightly marked by the right hand; for those to whom it is permitted to enter it will stand on the right hand of the Judge in the last examination. In the birth of the same Isaac, Ishmael had completed two weeks of years; evidently because of the sacrament of the Sabbath, which was observed in the Old Testament; so that in the fifteenth year, as if in the sign of the resurrection, that is, of the true circumcision, Isaac would be born; where it would be typified because the passing legal observance given by Moses would be succeeded by grace and truth which came by Jesus Christ. Therefore, when Isaac, who prefigured the grace of the New Testament, was born, his elder brother Ishmael, who signified the Old Testament, had completed the number seven in his age; because the observance of the law, in which the Sabbath held the greatest place, was fit to be extended until the time of grace; but the same number seven is doubled concerning the perfection of the same sacrament; because the law of God desires us to be freed both from servile, that is, from evil works in the body, and from harmful thoughts in the mind. The number seven is doubled because the law commands rest for bodies to its followers in this life and promises rest for souls in the future life; when Isaac was born and the first year of his age began, Ishmael began his fifteenth year because, with the grace of the Gospel appearing, even the law itself, spiritually understood, was found to be full of heavenly sacraments and to have preached the glory of the resurrection; but when Isaac had grown up, at the command of Sarah, Ishmael with his mother was cast out, it should not be thought that the Old Testament is to be abolished by the succession of the New Testament; but rather that the carnal observance of the law, with those who carnally, even while the grace of the Gospel shines, contend that it should be observed, ought to be expelled from the boundaries of the Church; but itself, understood in a spiritual sense, will lose neither a jot nor a tittle until all things are accomplished.

The Lord appeared to him in the valley of Mamre as he was sitting at the entrance of his tent in the heat of the day, etc. This appearance of the Lord is considered to be more sacred than all the previous ones, in which He was seen so many times by the blessed Abraham. And rightly so, after receiving the sacrament of circumcision, after the name was amplified by which he was to be marked as the father of all nations, he came to know the more secret mysteries of God, of which, notably, not only circumcision but also the uncircumcised were to be participants. Rightly, the appearance in the valley of Mamre is remembered as having taken place. For Mamre, as we read above, was indeed an Amorite by race, but together with his brothers, he was allied with Abraham; hence the valley of Mamre aptly represents our humility, who, having derived fleshly origin from the nations, have Abraham as our father in spirit and faith. To whom the Apostle, drawing from Abraham both the origin of flesh and virtue, says: We announce to you eternal life, which was with the Father and appeared to us; what we have seen and heard, we declare to you, so that you too may have fellowship with us (1 John 1:2). And indeed in this reading, apart from the spiritual understanding, it greatly edifies the readers that Abraham, seeing unknown men, immediately ran to meet them as if to offer the grace of hospitality to strangers; that he approached them humbly, worshipped on the ground, that he asked them to wait and accept his service, and hastily provided what they agreed to; and that he completed this not through servants and maidservants, but by himself and Sarah. It is indeed remarkable if, upon first seeing them, he did not believe they were men, why he would want to bring them water to wash their feet; how he would ask them to rest under a tree as if weary from walking; why he requested to strengthen their bodies with refreshment, as if they were laboring in fasting. If anyone seeks to investigate this reading more deeply, he will find it to be full of spiritual senses. For the fact that the Lord appeared to Abraham sitting at the entrance of his tent greatly suits both Abraham's devotion and that of all the heirs of the same promise, who testify that they are strangers and sojourners in this world but truly citizens of another life, that is, of the heavenly homeland. For we use tents in a journey or in war, but a house in our homeland, in which mystery, Isaac and Jacob are also read to have dwelled in tents. He who remains in the midst of his tent, knowing that he is a stranger and not destined to live forever in this world, and yet is not ashamed to engage himself as much as he can in the affairs and allurements of the world, remains. But Abraham and his followers, who conduct the things of the world out of necessity and not out of pleasure, sit as if at the entrance of their tent, because they are ready to leave the world at any moment, always with a joyful mind stretched towards the future rewards and waiting for the entrance into the following life. And it is well added, in the heat of the day; for the heat of the day, in which Abraham was sitting at the entrance of his tent, signifies the virtue of love with which he was burning in his mind with respect towards the Sun of righteousness. And such a state of place and time was fitting for him who was to see the Lord and enjoy His conversation, in which both the sojourner of this world would be figuratively represented, and irradiated by the light of true heavenly grace, and zealously enflamed with the love of divine contemplation.

And when he had lifted up his eyes, he saw three men standing near him; and when he saw them, he ran to meet them from the door of the tent, and worshipped upon the ground, and said: Lord, if I have found grace in thy sight, do not pass by thy servant, etc. The fact that three men appeared to him is a mystery of the Holy Trinity; indeed, when he saw three, he worshipped one, and prayed to the Lord, because although there is a Trinity in persons, there is nevertheless one and co-adorable equality in divinity of the Lord, just as in Isaiah when the angelic hosts were singing the glory of the Holy Trinity, saying: Holy, Holy, Holy, they immediately add the unity of dominion and deity, saying: The Lord God Almighty, the whole earth is full of His glory. And it is fittingly said that Abraham lifted up his eyes to see the angels, because indeed it is necessary that one who wishes to see the citizens of heaven, who desires to know the glory and secrets of the Divine Majesty, should raise every gaze of his mind from lowly desires and with diligent intention open up to the light of the true Sun. It is fittingly added that when he saw the angels, he ran to meet them, worshipping, and asked them not to pass him by, because it is necessary that whenever we conceive any taste of internal sweetness in our soul, we should immediately strive with all our prayers and prompt steps of good works, lest the same sweetness should leave us too quickly; but what is tasted for a time should refresh our minds somewhat longer by the memory of supernal sweetness and suspend them in the contemplation of eternal things, abstracted from the delights and cares of this world. It may perhaps move some that in this reading both Abraham and in the following Lot, having seen the angels, received them as guests as if they were men, and refreshed them with human food as if they were mortals, while yet they spoke with them as with God, and received their words no otherwise than as heavenly oracles. "But it is credible," as Saint Augustine says, "that both Abraham in the three men and Lot in the two men recognized the Lord; to whom they spoke with singular number, even when they considered them to be men. For they received them in no other way than as mortal men and ministered to them with human refreshment as if they were in need; but surely there was something by which they so excelled, though as men, that in them the Lord was present as He is wont to be in prophets, so that those who offered them hospitality could not doubt; and therefore sometimes they called them in the plural, and at other times the Lord in the singular in them. Scripture testifies that they were angels, not only in this book of Genesis where these events are narrated, but also in the Epistle to the Hebrews, where, when hospitality was praised, it says: By this some, being unaware, entertained angels (Heb. XIII, 2)." However, in this reception one can appropriately sense that it was divinely arranged so that the patriarchs, seeing angels, would receive them as men indeed but venerate them as God, so that through the distinction of such service and devotion it would be prefigured that in the future the Lord Himself, appearing in the flesh, would be satisfied with carnal foods and received in human hospitality. In which hospitality, however, He would more be devoted to preaching the gospel and healing the sick than to eating and drinking, as the gospel history often testifies. Finally, the interpreters of the sacred scriptures have understood this place as accomplishing what the Lord said to the Jews: Your father Abraham rejoiced to see my day; and he saw it, and was glad (John VIII, 56). He saw indeed the day of the Lord, when seeing the three angels, he worshipped one, and addressed the Lord, because in the distinction of the three persons, he recognized the essence of one majesty.

The flour that Sarah mixed to refresh the angels is the internal sweetness of God's word, which the prophet promises to the heavenly Jerusalem, that is, the holy Church, saying of the Lord: "He makes peace your borders, and fills you with the finest of the wheat" (Psalm 147:14). And immediately, explaining more clearly what the finest wheat is, he added: "He sends out his command to the earth." Now there are three measures of this same flour because in the sacred Scripture there is a threefold sense of understanding, namely the historical, the allegorical, and the anagogical; for example: "Lord, I have loved the beauty of your house" (Psalm 26:8); according to history, he desired the beauty of the house which Solomon made for the Lord to remain inviolate, being praised by his people in it. According to allegory, he desired the beauty of the holy Church to shine throughout the whole world, to whom the Apostle says: "For you are the temple of God" (2 Corinthians 6:16). According to anagogy, that is, the sense leading to higher things, he desired to see the beauty of the heavenly homeland, that is, the house not made with hands but eternal in the heavens. The Lord also mentions this threefold measure in the gospel parable, saying: "The kingdom of heaven is like leaven which a woman took and hid in three measures of flour, until it was all leavened." For the evangelical leaven the woman hid in the three measures of flour to leaven the whole, when the holy Church, which Sarah signifies in this place, either preaches history in the Scriptures, reveals allegory, or lifts up the eye of its exposition to contemplate higher things. It always instills the power of either the Lord's or fraternal charity in its words. And no one should think they have rightly understood Scripture in which they have not found the institution of charity. A "measure" was a type of measurement among the Palestinians, holding one and a half bushels.

And when they had eaten, they said to him, “Where is Sarah your wife?” He answered, “Behold, she is in the tent.” Then he said, “I will return to you at this time next year, if life be with us, and Sarah your wife shall have a son.” Both indeed the lords of the house, and evidently Abraham and Sarah, prepared with the utmost haste a meal; but as if in a well-ordered house, Abraham, with the meals prepared, more boldly approached the Lord; Sarah, with womanly fear and modesty, restrained herself in the tent, in fact behind the tent door, and no longer dared to approach, but listened from within to what her husband spoke with the Lord. Therefore, since she was both devoted to God and well subjected to her husband, she heard the joy of childbirth which she greatly desired; not indeed any childbirth, but that in which both she in the future and all nations would receive a blessing. And well, after the angels had eaten, they promised a son to their hosts, because when the Lord has accepted the meals of our good work and faith, he rewards us with the grace of his blessing. But the angels ate, or rather seemed to have eaten, as holy Raphael explained to Tobias, to signify the mystery of the Lord’s Incarnation, in which he, the Angel of Great Counsel, was to eat as a man, not only visibly appearing, but even sitting at the table of men and eating; but they, as the same Raphael said, used invisible food, that is, which cannot be seen by men living in the flesh, namely the joy of contemplation; of which also the Lord in the Gospel: “For their angels,” he says, “always see the face of my Father who is in heaven” (Matthew 18:10); for they always see, that is, even when they come outside to us to minister something; it is credible, moreover, that the food which they ate, as soon as it touched their spiritual or ethereal body, was consumed like water thrown into a burning flame, and not like water poured into dry land to refresh their bodies, as happens to us when we eat.

They were both old and advanced in years, and it had ceased to be with Sarah after the manner of women. To highlight the growth of heavenly power, he says that both were old, and moreover that Sarah, having been barren, was now also deprived of her menstrual blood, because of which she could no longer conceive, even if she had not been barren. Further, if a woman is of such an advanced age that the usual flow of women still occurs to her, she can conceive from a young man, but not from an old man; although the old man can still beget from a young woman, as Abraham, after Sarah's death, was able to beget from Keturah, because he found her age to be vigorous; this therefore is what the Apostle clearly commends when he says: "He believed against hope in hope, that he might become the father of many nations, according to what was said to him: Thus shall your offspring be; and not weakening in faith, he did not consider his own body already dead, being about a hundred years old, and the deadness of Sarah's womb; in the promise of God he did not doubt" (Romans 4:18). For this reason he says that Abraham's body was already dead, because he could still beget from any woman who still had some final period of time left for bearing children at that age: we must understand the body as dead for some purposes, not for all; for if for all, then it is not the old age of the living, but the corpse of the dead.

"Is anything too hard for the Lord? At the appointed time I will return to you, about this time next year, and Sarah shall have a son." With this statement heard, all doubt was so removed, and her faith so confirmed, that the Apostle rightly says of her: "By faith even Sarah herself received power to conceive." But when he says "I will return to you," and added "with life as a companion," he speaks in a human manner, as if he were to say: "If life is a companion." But it should be understood more deeply that the angels always converse with life as a companion either in heaven or descend to earth, certainly with that life that says: "For as the Father has life in Himself, so He has granted the Son also to have life in Himself;" by whose vision and enlightenment the angels and holy men are perpetually blessed. Indeed, this place seems comparable by contrast with the deeds of the first man; for after his transgression, he did not see the Lord God but is said to have heard the voice of the Lord God walking in the garden; here, the future blessing's faith, hope, and love inflamed he saw the Lord standing, because surely with this he was to remain, the contemplation of divine clarity having departed from him. Hearing the voice of the Lord God, trembling he hid himself because he truly blushed at his error. Here, having seen the Lord, he immediately joyfully ran, believing that by the merit of obedience he had pleased Him. He on the cool of the day, this one at the very heat of the day; because this one burned with the fire of divine love, the other by sinning had driven away the light of divine protection and love from himself. This one receives and entertains the Lord as a guest, to show with the carnal feast provided that he would foster Him with spiritual feasts in his heart by living devoutly, according to what the Lord Himself promised about His lovers: "Behold, I stand at the door and knock; if anyone hears My voice and opens the door, I will come in to him and dine with him, and he with Me" (Revelation 3:20). The other, that is, the first man, who ate what was forbidden, lost those delights which he could have had perpetually in the presence of the Lord and His angels, also being visibly excluded from the tree of life so that it might be openly shown that he had lost the incorruptible fruit of wisdom, which he used to enjoy invisibly. And because the blessed Abraham by the merit of pious devotion had already tasted the fruit of wisdom and life, which is Christ, rightly he is said to have seen and received the Lord standing under a tree. There Eve, having abandoned the fear of God, having neglected her husband's counsel, rashly approached the serpent, in which the devil was speaking, by whom she was deceived into eating what was forbidden, and also made her husband complicit in her transgression; for which reason, receiving the sentence of just condemnation with her husband, she heard among other things: "In pain you shall bring forth children" (Genesis 3:16); and first she bore Cain, the cursed son and fratricide. Here Sarah, submitted to the fear of God, following likewise the religious faith and deeds of her husband, awaited at home the Lord's appearance until her husband came and learned what should be done; but also with the dishes prepared for the Lord's reception, she nevertheless modestly remained at home and rejoiced in having her husband go ahead with them to the Lord and offer the gifts of her devotion and his own. Therefore both received the reward of their kindness with a promised offspring; and not just any offspring, but indeed the one in whom all nations would be blessed. And rightly so, for there the guilt of transgression was punished with due retribution in the first Adam; here the time of redemption through the second Adam was both foreshadowed and prepared. It follows: