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Public-domain commentary
Matthew Henry
From his Commentary on the Whole Bible. Henry comments on passages, not single verses — this entry covers Genesis 21:1–8. His three-level outline is real structure in the source text, so it is rendered as structure.
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.
Historical interpretation
Historical Reception
One surviving comment on this verse from the historical church.
And Abraham called the name of his son whom Sarah bore to him Isaac. Isaac is interpreted as Laughter or Joy, which very name is fitting for all the faithful, to whom among other goods of the heavenly inheritance, their Redeemer promises by saying: "Again I will see you, and your heart will rejoice, and your joy no one will take from you" (John XVI, 1).
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Summary
Genesis 21:3 records the profound moment Abraham formally named his long-awaited son, Isaac, signifying the miraculous fulfillment of God's covenant promise to him and Sarah. This concise verse marks the culmination of decades of anticipation and divine intervention, establishing the lineage through which God's redemptive plan would unfold, ultimately leading to the Messiah.
Context
Literary Context
This verse is situated immediately after the miraculous birth of Isaac in Genesis 21:1-2, a pivotal event that follows decades of barrenness for Sarah and the advanced age of both Abraham and Sarah. It directly fulfills the divine promise first given in Genesis 17:19, where God explicitly commanded Abraham to name the son born to Sarah "Isaac." The naming act in this verse is not merely a cultural formality but an act of obedience and a public declaration of the child's identity as the promised heir, setting him apart from Ishmael, who was born of human initiative in Genesis 16. The narrative proceeds to describe Isaac's circumcision and weaning, further establishing his identity and place within the covenant family.
Historical & Cultural Context
In ancient Near Eastern cultures, the naming of a child was a significant event, often performed by the father and carrying deep meaning. Names were not arbitrary labels but frequently reflected circumstances of birth, parental hopes, or divine pronouncements. For Abraham to name his son "Isaac" (meaning "he laughs" or "laughter") was a direct act of obedience to God's specific instruction, as detailed in Genesis 17:19. This act would have been understood by contemporary audiences as a public affirmation of the child's legitimacy and his unique role within the family and tribal structure. The cultural expectation was for a son to carry on the family line and inherit the father's blessings, making Isaac's birth and naming of paramount importance for the continuation of Abraham's lineage and, by extension, God's covenant.
Key Themes
Genesis 21:3 powerfully contributes to several overarching themes in the book of Genesis and the broader biblical narrative. Foremost is the theme of God's Faithfulness to His Promises, as Isaac's birth and naming directly fulfill the long-awaited covenant promise made to Abraham in Genesis 12:2-3. It also highlights Divine Sovereignty and Miraculous Intervention, demonstrating God's ability to act beyond human limitations and natural laws to achieve His purposes, particularly in light of Abraham and Sarah's advanced age, as reflected in Genesis 18:14. The significance of Names and Their Meaning is central, as Isaac's name ("laughter") encapsulates the complex emotions—disbelief, skepticism, and ultimate joy—that surrounded his conception and birth, a theme further explored in Genesis 21:6. Finally, the verse underscores the theme of Obedience and Faith on Abraham's part, as he faithfully carries out God's command regarding the naming of his son, solidifying his role as a patriarch of faith.
Exposition and Analysis
Key Word Analysis
A primitive root meaning "to call out to," "address by name," "mention," or "proclaim." In this context, it signifies Abraham's authoritative act of bestowing the divinely appointed name upon his son. It is not a casual naming but a formal declaration, an act of obedience that carries the weight of a public proclamation and acknowledgment of God's word.
From the root meaning "to build," referring to a son as a "builder of the family name." This term emphasizes Isaac's role not just as a male offspring but as the designated heir, the one through whom the family line, and more importantly, the covenant promises, would continue and expand. His identity as "the son" is crucial for the unfolding of God's plan.
Derived from a root meaning "to laugh" or "mockery." This name, explicitly commanded by God in Genesis 17:19, is profoundly symbolic. It encapsulates the initial laughter of disbelief from both Abraham and Sarah when they first heard the promise of a child in their old age, and ultimately, Sarah's laughter of profound joy and wonder upon his birth, as recorded in Genesis 21:6. The name thus serves as a perpetual reminder of God's power to transform human doubt into divine delight and fulfillment.
Verse Breakdown
"And Abraham called the name of his son"
This clause highlights Abraham's pivotal role as the patriarch and the one responsible for formally naming the child. His act of "calling the name" is an act of obedience to God's prior instruction, signifying his acceptance of the divine promise and his active participation in its fulfillment. It underscores the authority and responsibility vested in him by God.
"that was born unto him, whom Sarah bare to him"
This phrase emphasizes the unique and miraculous parentage of Isaac. It explicitly states that the son was "born unto him" (Abraham) and that Sarah "bare to him" (Abraham), leaving no ambiguity about the mother's identity. This is crucial given the earlier narrative involving Hagar and Ishmael, firmly establishing Isaac as the legitimate, divinely appointed heir born of the covenant mother, Sarah, despite her advanced age.
"Isaac"
The culmination of the verse, this single word reveals the specific, divinely ordained name for the child. The name "Isaac" (meaning "laughter") is not merely an appellation but a summary of the entire miraculous story surrounding his birth, encapsulating the initial human disbelief and the ultimate divine joy that accompanied the fulfillment of God's impossible promise.
Literary Devices
The verse employs several literary devices to convey its profound significance. Conciseness is evident, as the verse succinctly captures a moment of immense theological weight without unnecessary elaboration. This brevity highlights the directness of God's fulfilled promise. Repetition of the idea of "birth" or "bearing" ("born unto him," "Sarah bare to him") subtly reinforces the miraculous nature of Isaac's arrival and his legitimate parentage, distinguishing him from Ishmael. Most notably, Symbolism is present in the name "Isaac" itself. The name "Laughter" is a powerful symbol of God's ability to turn human skepticism and the seemingly impossible into overwhelming joy and undeniable reality, serving as a perpetual reminder of divine faithfulness and the transformation of doubt into delight.
Theological and Thematic Connections
Genesis 21:3 is a profound testament to the unwavering faithfulness of God, demonstrating His commitment to His covenant promises despite human limitations and the passage of time. Isaac's birth, long-awaited and seemingly impossible, serves as a powerful illustration that God's word will always come to pass, regardless of the circumstances. This event solidifies the lineage through which the Abrahamic covenant would continue, emphasizing God's meticulous and sovereign plan for redemption. The naming of Isaac, as commanded by God, underscores the significance of divine revelation and human obedience, highlighting that God's promises often require a response of faith and action from His people.
Reflection and Application
Genesis 21:3 offers profound lessons for contemporary believers, reminding us of God's unfailing faithfulness and His ability to bring His promises to fruition in His perfect timing. Just as Abraham and Sarah endured decades of waiting for Isaac, we are encouraged to persevere in faith, even when God's promises seem delayed or impossible from a human perspective. Our waiting periods are not periods of divine inaction but opportunities to deepen our trust, dependence, and intimacy with God. The very name Isaac, meaning "laughter," beautifully symbolizes God's capacity to transform our moments of doubt, skepticism, or even sorrow into overwhelming joy and a powerful testimony of His power. What may appear as an insurmountable obstacle or a source of disbelief in our lives can, through God's miraculous intervention, become a profound source of celebration and a living testament to His reliability. This verse powerfully reaffirms that God's word is utterly dependable and will always accomplish its intended purpose, inspiring us to stand firm on His promises, knowing that He is faithful to fulfill them in ways that often exceed our imagination.
Questions for Reflection
FAQ
Why is the name "Isaac" so significant?
The name "Isaac" (Hebrew: Yitschâq) means "he laughs" or "laughter." It is profoundly significant because it encapsulates the entire narrative surrounding his miraculous birth. It reflects the initial laughter of disbelief from both Abraham (Genesis 17:17) and Sarah (Genesis 18:12) when they first heard the promise of a child in their old age. This human skepticism then transforms into profound joy and laughter upon his actual, miraculous birth, as Sarah famously declares, "God hath made me to laugh, so that all that hear will laugh with me" (Genesis 21:6). Thus, the name serves as a perpetual, living reminder of God's ability to turn human doubt and impossible circumstances into divine delight and the undeniable fulfillment of His promises.
Christ-Centered Fulfillment
The birth and naming of Isaac in Genesis 21:3 profoundly foreshadows the coming of Jesus Christ, serving as a powerful Old Testament type pointing to the ultimate fulfillment in the New Testament. Isaac, as the child of promise born supernaturally to aged parents, prefigures Jesus, the ultimate "seed" of Abraham through whom all nations would be blessed (Galatians 3:16). Just as Isaac's birth defied natural limitations, pointing to God's miraculous power to bring forth life from what was humanly impossible, so too does the virgin birth of Jesus demonstrate God's ultimate, supernatural intervention in human history to bring forth the Savior (Matthew 1:18-25). Isaac's very existence was a testament to God's faithfulness to His "impossible" promises, a faithfulness perfectly culminated in the incarnation, life, atoning death, and glorious resurrection of Jesus Christ, who is the true "laughter" and everlasting joy for all humanity. Through Christ, the covenant promises made to Abraham find their ultimate "Yes" and "Amen" (2 Corinthians 1:20), bringing spiritual life and blessing to all who believe.