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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 21:7 captures Sarah's profound joy, astonishment, and triumphant declaration of God's faithfulness following the miraculous birth of Isaac. Her rhetorical question underscores the human impossibility of her situation—a woman well past childbearing years not only conceiving and giving birth but also nursing a child—thereby magnifying the divine power that brought this long-awaited promise to fruition in her old age.
CONTEXT
EXPOSITION AND ANALYSIS
Key Word Analysis
Verse Breakdown
Literary Devices
Sarah's utterance in Genesis 21:7 is rich with Rhetorical Question, a powerful literary device that does not seek an answer but rather makes an emphatic statement. Her question, "Who would have said unto Abraham, that Sarah should have given children suck?", serves to highlight the sheer impossibility of the situation from a human perspective, thereby magnifying the miraculous nature of God's intervention. This rhetorical question also carries a strong element of Irony, as Sarah, who once laughed in disbelief at the promise of a son in her old age (Genesis 18:12), now laughs with triumphant joy and astonishment at its fulfillment. The contrast between her past skepticism and present exultation underscores God's transformative power. Furthermore, the act of "giving children suck" serves as powerful Symbolism of complete and undeniable motherhood, moving beyond mere conception and birth to the tangible, nurturing reality of raising a child, which was once thought impossible for her.
THEOLOGICAL AND THEMATIC CONNECTIONS
Genesis 21:7 is a profound declaration of God's unwavering faithfulness and omnipotence. It reveals that God's promises are not contingent upon human capability or natural circumstances, but solely upon His divine will and power. Sarah's experience transforms her initial laughter of doubt into laughter of triumphant joy, illustrating God's capacity to redeem and transform human experiences and emotions, bringing forth life and fulfillment where only barrenness and despair once existed. This verse stands as a testament to the truth that what is impossible with man is possible with God, reinforcing the biblical theme of divine intervention in human history to accomplish His redemptive purposes.
REFLECTION AND APPLICATION
Sarah's story, culminating in this verse, serves as a powerful reminder for believers today that God's timing is perfect, even when promises seem delayed or impossible from a human perspective. For those facing seemingly insurmountable obstacles, long-held desires, or barren seasons in life—whether physical, spiritual, or relational—this verse offers profound hope that God can bring about what is humanly impossible. Just as God was faithful to Abraham and Sarah, He remains faithful to His people and His promises today, strengthening our faith in God's unchanging character and His ability to perform miracles in our own lives. It invites us to trust in God's power to fulfill His word, even when all natural indicators suggest otherwise, transforming our doubts into declarations of His goodness and faithfulness.
Questions for Reflection
FAQ
Why is Sarah's age so significant in this verse?
Answer: Sarah's age, approximately 90 years old, is profoundly significant because it highlights the sheer impossibility of her conceiving and nursing a child through natural means. This emphasizes that Isaac's birth was a direct, undeniable miracle from God, demonstrating His power to overcome all human limitations and fulfill His promises. It underscores that God's faithfulness is not bound by biological or chronological constraints.
What does Sarah mean by "Who would have said unto Abraham, that Sarah should have given children suck?"
Answer: This is a powerful rhetorical question expressing profound astonishment, joy, and vindication. It means, "No one would have ever believed or predicted to Abraham that I, Sarah, would be able to bear and nurse a child in my old age." It underscores the unexpected and miraculous nature of Isaac's birth from a human perspective, turning what was once a source of shame and doubt into a public declaration of God's incredible power and faithfulness.
How does Sarah's initial laughter of disbelief relate to her joy in this verse?
Answer: In Genesis 18:12, Sarah laughed skeptically when she overheard the promise of a son in her old age, questioning how such a thing could be. Here, her joy and astonishment represent a profound transformation of that initial laughter. God turned her laughter of doubt into laughter of triumphant joy and wonder, demonstrating His ability to fulfill His word and bring about unexpected blessings, even redeeming and transforming human skepticism into praise.
CHRIST-CENTERED FULFILLMENT
The miraculous birth of Isaac, the son of promise born to an elderly, barren woman, serves as a profound foreshadowing of the even greater miracle of the birth of Jesus Christ. Just as Isaac's birth was not by natural means but by divine intervention, so too was Christ conceived by the Holy Spirit, not by human will or natural procreation (Matthew 1:18). Isaac's birth secured the physical lineage through whom the covenant promises would flow, ultimately leading to Christ, the ultimate "seed" of Abraham who brings spiritual blessing and salvation to all nations (Galatians 3:16). Sarah's joy over her miraculous son, Isaac, points forward to the ultimate joy and eternal life brought by the Son of God, Jesus, who is the fulfillment of God's eternal covenant with humanity (John 3:16). Her experience of barrenness turned to fruitfulness mirrors the spiritual barrenness of humanity transformed into spiritual life through Christ's redemptive work (Ephesians 2:4-5).