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Commentary on Genesis 21 verses 1–8
Long-looked-for comes at last. The vision concerning the promised seed is for an appointed time, and now, at the end, it speaks, and does not lie; few under the Old Testament were brought into the world with such expectation as Isaac was, not for the sake of any great person eminence at which he was to arrive, but because he was to be, in this very thin, a type of Christ, that seed which the holy God had so long promised and holy men so long expected. In this account of the first days of Isaac we may observe,
I. The fulfilling of God's promise in the conception and birth of Isaac, Gen 21:1, Gen 21:2. Note, God's providences look best and brightest when they are compared with his word, and when we observe how God, in them all, acts as he has said, as he has spoken. 1. Isaac was born according to the promise. The Lord visited Sarah in mercy, as he had said. Note, No word of God shall fall to the ground; for he is faithful that has promised, and God's faithfulness is the stay and support of his people's faith. He was born at the set time of which God had spoken, Gen 21:2. Note, God is always punctual to his time; though his promised mercies come not at the time we set, they will certainly come at the time he sets, and that is the best time., 2. He was born by virtue of the promise: Sarah by faith received strength to conceive Heb 11:11. God therefore by promise gave that strength. It was not by the power of common providence, but by the power of a special promise, that Isaac was born. A sentence of death was, as it were, passed upon the second causes: Abraham was old, and Sarah old, and both as good as dead; and then the word of God took place. Note, True believers, by virtue of God's promises, are enabled to do that which is above the power of human nature, for by them they partake of a divine nature, Pe2 1:4.
II. Abraham's obedience to God's precept concerning Isaac.
1.He named him, as God commanded him, Gen 21:3. God directed him to a name for a memorial, Isaac, laughter; and Abraham, whose office it was, gave him that name, though he might have designed him some other name of a more pompous signification. Note, It is fit that the luxuriancy of human invention should always yield to the sovereignty and plainness of divine institution; yet there was good reason for the name, for, (1.) When Abraham received the promise of him he laughed for joy, Gen 17:17. Note, When the sun of comfort has risen upon the soul it is good to remember how welcome the dawning of the day was, and with what exultation we embraced the promise. (2.) When Sarah received the promise she laughed with distrust and diffidence. Note, When God gives us the mercies we began to despair of we ought to remember with sorrow and shame our sinful distrusts of God's power and promise, when we were in pursuit of them. (3.) Isaac was himself, afterwards, laughed at by Ishmael (Gen 21:9), and perhaps his name bade him expect it. Note, God's favourites are often the world's laughing-stocks. (4.) The promise which he was not only the son, but the heir of, was to be the joy of all the saints in all ages, and that which would fill their mouths with laughter.
2.He circumcised him, Gen 21:4. The covenant being established with him, the seal of the covenant was administered to him; and though a bloody ordinance, and he a darling, yet it must not be omitted, no, nor deferred beyond the eighth day. God had kept time in performing the promise, and therefore Abraham must keep time in obeying the precept.
III. The impressions which this mercy made upon Sarah.
1.It filled her with joy (Gen 21:6): "God has made me to laugh; he has given me both cause to rejoice and a heart to rejoice." Thus the mother of our Lord, Luk 1:46, Luk 1:47. Note, (1.) God bestows mercies upon his people to encourage their joy in his work and service; and, whatever is the matter of our joy, God must be acknowledged as the author of it, unless it be the laughter of the fool. (2.) When mercies have been long deferred they are the more welcome when they come. (3.) It adds to the comfort of any mercy to have our friends rejoice with us in it: All that hear will laugh with me; for laughing is catching. See Luk 1:58. Others would rejoice in this instance of God's power and goodness, and be encouraged to trust in him. See Psa 119:74.
2.It filled her with wonder, Gen 21:7. Observe here, (1.) What it was she thought so wonderful: That Sarah should give children suck, that she should, not only bear a child, but be so strong and hearty at the age as to give it suck. Note, Mothers, if they be able, ought to be nurses to their own children. Sarah was a person of quality, was aged; nursing might be thought prejudicial of herself, or to the child, or to both; she had choice of nurses, no doubt, in her own family: and yet she would do her duty in this matter; and her daughters the good wives are while they thus do well, Pe1 3:5, Pe1 3:6. See Lam 4:3. (2.) How she expressed her wonder: "Who would have said it? The thing was so highly improbable, so near to impossible, that if any one but God had said it we could not have believed it." Note, God's favours to his covenant-people are such as surpass both their own and others' thoughts and expectations. Who could imagine that God should do so much for those that deserve so little, nay, for those that deserve so ill? See Eph 3:20; Sa2 7:18, Sa2 7:19. Who would have said that God should send his Son to die for us, his Spirit to sanctify us, his angels to attend us? Who would have said that such great sins should be pardoned, such mean services accepted, and such worthless worms taken into covenant and communion with the great and holy God?
IV. A short account of Isaac's infancy: The child grew, Gen 21:8. Special notice is taken of this, though a thing of course, to intimate that the children of the promise are growing children. See Luk 1:80; Luk 2:40. Those that are born of God shall increase of God, Col 2:19. He grew so as not always to need milk, but was able to bear strong meat, and then he was weaned. See Heb 5:13, Heb 5:14. And then it was that Abraham made a great feast for his friends and neighbours, in thankfulness to God for his mercy to him. He made this feast, not on the day that Isaac was born, that would have been too great a disturbance to Sarah; nor on the day that he was circumcised, that would have been too great a diversion from the ordinance; but on the day that he was weaned, because God's blessing upon the nursing of children, and the preservation of them throughout the perils of the infant age, are signal instances of the care and tenderness of the divine providence, which ought to be acknowledged, to its praise. See Psa 22:9, Psa 22:10; Hos 11:1.
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SUMMARY
Genesis 21:1 records the momentous fulfillment of God's long-standing promise to Abraham and Sarah, signaling the miraculous and divinely orchestrated birth of Isaac. This pivotal verse powerfully declares that the Lord actively intervened to bring about this event precisely as He had foretold, underscoring His unwavering faithfulness, sovereign power, and the absolute reliability of His spoken word, even in the face of human impossibility and prolonged waiting.
CONTEXT
EXPOSITION AND ANALYSIS
Key Word Analysis
Verse Breakdown
Literary Devices
Genesis 21:1, though concise, employs several significant literary devices to amplify its profound theological message. The most prominent is Repetition and Parallelism. The phrases "as he had said" and "as he had spoken" are used in parallel constructions, creating a powerful rhetorical emphasis on the absolute certainty and reliability of God's word. This Anaphora ensures that the reader grasps the foundational truth: God's promises are immutable. The verse also functions as a Climax in the narrative, bringing to a head the long-standing tension and anticipation surrounding the promised heir. The simplicity of the language belies the immense significance of the event, allowing the divine action to stand out clearly. Furthermore, there is a subtle Irony at play when considering Sarah's earlier laughter of disbelief (Genesis 18:12), which is now transformed into the joy signified by Isaac's name ("he laughs").
THEOLOGICAL AND THEMATIC CONNECTIONS
Genesis 21:1 is a foundational declaration of God's absolute faithfulness to His covenant promises, demonstrating that His word is not merely a suggestion but a decree that will inevitably come to pass. This verse profoundly illustrates God's sovereignty over all aspects of creation and human life, particularly His power to transcend natural limitations and bring about His will. The miraculous birth of Isaac, through a barren and elderly woman, serves as a powerful testament to God's ability to accomplish what is humanly impossible, reinforcing the truth that His power is not constrained by human weakness or biological realities. This event is a critical juncture in the unfolding of God's redemptive plan, establishing the lineage through which the Messiah would eventually come, thereby connecting the Abrahamic covenant directly to the ultimate fulfillment in Christ.
REFLECTION AND APPLICATION
Genesis 21:1 offers profound encouragement for believers today, reminding us that God is perpetually faithful to His word, even when circumstances seem to contradict divine promises or when prolonged delays test our patience. Sarah's long wait for Isaac's birth, and its eventual occurrence when she was "past age," teaches us perseverance and the importance of holding onto hope, knowing that God's timing is perfect. The "appointed time" (Genesis 18:14) will come when it is clear that the breakthrough is solely God's doing, leaving no room for human boasting. Furthermore, if God can enable a barren, elderly woman to conceive, He can certainly work in seemingly impossible situations in our own lives, strengthening our faith in His power to act beyond human capability. This verse calls us to trust in God's character and the efficacy of His promises, even when the path forward is unclear or seems humanly impossible.
Questions for Reflection
FAQ
What is the significance of the phrase "the LORD visited Sarah"?
Answer: The Hebrew word for "visited" (paqad) means more than a casual call. In this context, it signifies God's deliberate, purposeful, and benevolent intervention. It means He "remembered" Sarah with the intent to act on His promise, actively intervening in her life to bring about the miraculous conception and birth of Isaac. It highlights God's personal and sovereign involvement in fulfilling His word, demonstrating His active presence and power in human affairs, especially in bringing His promises to fruition.
Why is the repetition "as he had said, and... as he had spoken" emphasized?
Answer: This repetition serves as a powerful rhetorical device to underscore the absolute certainty, authority, and reliability of God's word (davar and ʼâmar). It is not merely a stylistic choice but a theological declaration, stressing that God's promises are not suggestions but divine decrees that will inevitably come to pass. It ensures that the reader understands that Isaac's birth was not a coincidence or a natural event, but the direct, precise, and unfailing fulfillment of God's prior declarations, reinforcing His unwavering faithfulness and the immutable nature of His promises, as seen in Isaiah 55:11.
CHRIST-CENTERED FULFILLMENT
Genesis 21:1 finds its ultimate Christ-centered fulfillment in several profound ways, serving as a powerful foreshadowing of God's greater redemptive plan. The miraculous birth of Isaac, the promised son through whom Abraham's lineage would continue, directly anticipates the even more miraculous birth of Jesus Christ, the ultimate "seed" of Abraham (Galatians 3:16). Just as Isaac's birth defied natural limitations, so too did Christ's virgin birth demonstrate God's sovereign power to bring forth life in impossible circumstances, highlighting that "with God nothing will be impossible" (Luke 1:37). Furthermore, God's unwavering faithfulness in fulfilling His covenant promise to Abraham through Isaac ultimately culminates in the New Covenant established through Jesus' sacrificial death and resurrection (Hebrews 8:6). Christ is the true Isaac, the son of promise, through whom all the nations of the earth are blessed (Genesis 22:18; Acts 3:25). The reliability of God's word demonstrated in Genesis 21:1 serves as a foundational assurance for the greater promises of salvation, eternal life, and the coming of God's Kingdom, all secured and fulfilled in Jesus Christ (2 Corinthians 1:20).