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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 17:15–22. His three-level outline is real structure in the source text, so it is rendered as structure.
Here is, I. The promise made to Abraham of a son by Sarai, that son in whom the promise made to him should be fulfilled, that he should be the father of many nations; for she also shall be a mother of nations, and kings of people shall be of her, Gen 17:16. Note, 1. God reveals the purposes of his good-will to his people by degrees. God had told Abraham long before that he should have a son, but never till now that he should have a son by Sarai. 2. The blessing of the Lord makes fruitful, and adds no sorrow with it, no such sorrow as was in Hagar's case. "I will bless her with the blessing of fruitfulness, and then thou shalt have a son of her." 3. Civil government and order are a great blessing to the church. It is promised, not only that people, but kings of people, should be of her; not a headless rout, but a well-modelled well-governed society.
II.The ratification of this promise was the change of Sarai's name into Sarah (Gen 17:15), the same letter being added to her name that was to Abraham's, and for the same reasons. Sarai signifies my princess, as if her honour were confined to one family only. Sarah signifies a princess - namely, of multitudes, or signifying that from her should come the Messiah the prince, even the prince of the kings of the earth.
III.Abraham's joyful, thankful, entertainment of this gracious promise, Gen 17:17. Upon this occasion he expressed,
1.Great humility: He fell on his face. Note, The more honours and favours God confers upon us the lower we should be in our own eyes, and the more reverent and submissive before God.
2.Great joy: He laughed. It was a laughter of delight, not of distrust. Note, Even the promises of a holy God, as well as his performances, are the joys of holy souls; there is the joy of faith as well as the joy of fruition. Now it was that Abraham rejoiced to see Christ's day. Now he saw it and was glad (Joh 8:56); for, as he saw heaven in the promise of Canaan, so he saw Christ in the promise of Isaac.
3.Great admiration: Shall a child be born to him that is a hundred years old? He does not here speak of it as at all doubtful (for we are sure that he staggered not at the promise, Rom 4:20), but as very wonderful and that which could not be effected but by the almighty power of God, and as very kind, and a favour which was the more affecting and obliging for this, that it was extremely surprising, Psa 126:1, Psa 126:2.
IV.Abraham's prayer for Ishmael:
O that Ishmael might live before thee! Gen 17:18. This he speaks, not as desiring that Ishmael might be preferred before the son he should have by Sarah; but, dreading lest he should be abandoned and forsaken of God, he puts up this petition on his behalf. Now that God is talking with him he thinks he has a very fair opportunity to speak a good word for Ishmael, and he will not let it slip. Note,
1.Though we ought not to prescribe to God, yet he gives us leave, in prayer, to be humbly free with him, and particular in making known our requests, Phi 4:6. Whatever is the matter of our care and fear should be spread before God in prayer.
2.It is the duty of parents to pray for their children, for all their children, as Job, who offered burnt offerings according to the number of them all, Job 1:5. Abraham would not have it thought that, when God promised him a son by Sarah, which he so much desired, then his son by Hagar was forgotten; no, still he bears him upon his heart, and shows a concern for him. The prospect of further favours must not make us unmindful of former favours.
3.The great thing we should desire of God for our children is that they may live before him, that is, that they may be kept in covenant with him, and may have grace to walk before him in their uprightness. Spiritual blessings are the best blessings, and those for which we should be most earnest with God, both for ourselves and others. Those live well that live before God.
V.God's answer to his prayer; and it is an answer of peace. Abraham could not say that he sought God's face in vain.
1.Common blessings are secured to Ishmael (Gen 17:20): As for Ishmael, whom thou art in so much care about, I have heard thee; he shall find favour for thy sake; I have blessed him, that is, I have many blessings in store for him.
(1.)His posterity shall be numerous: I will multiply him exceedingly, more than his neighbours. This is the fruit of the blessing, as that, Gen 1:28.
(2.)They shall be considerable: Twelve princes shall he beget. We may charitably hope that spiritual blessings also were bestowed upon him, though the visible church was not brought out of his loins and the covenant was not lodged in his family. Note, Great plenty of outward good things is often given to those children of godly parents who are born after the flesh, for their parents' sake.
2.Covenant blessings are reserved for Isaac, and appropriated to him, Gen 17:19, Gen 17:21. If Abraham, in his prayer for Ishmael, meant that he would have the covenant made with him, and the promised seed to come from him, then God did not answer him in the letter, but in that which was equivalent, nay, which was every way better.
(1.)God repeats to him the promise of a son by Sarah: She shall bear thee a son indeed. Note, Even true believers need to have God's promises doubled and repeated to them, that they may have strong consolation, Heb 6:18. Again, Children of the promise are children indeed.
(2.)He names that child - calls him Isaac, laughter, because Abraham rejoiced in spirit when this son was promised him. Note, If God's promises be our joy, his mercies promised shall in due time be our exceeding joy. Christ will be laughter to those that look for him; those that now rejoice in hope shall shortly rejoice in having that which they hope for: this is laughter that is not mad.
(3.)He entails the covenant upon that child: I will establish my covenant with him. Note, God takes whom he pleases into covenant with himself, according to the good pleasure of his will. See Rom 9:8, Rom 9:18. Thus was the covenant settled between God and Abraham, with its several limitations and remainders, and then the conference ended: God left off talking with him, and the vision disappeared, God went up from Abraham. Note, Our communion with God here is broken and interrupted; in heaven it will be a continual and everlasting feast.
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Summary
Genesis 17:21 serves as God's definitive declaration to Abraham, unequivocally stating that His sacred covenant promises will be fulfilled through Isaac, the son miraculously conceived and born to Sarah, rather than through Ishmael. This pivotal verse underscores God's absolute sovereignty in His redemptive plan, His unwavering faithfulness to His specific word, and the precise, divinely appointed timing for the continuation of His eternal purposes.
Context
Literary Context
This verse is God's direct and conclusive response to Abraham's plea concerning Ishmael in Genesis 17:18. Prior to this, God had appeared to Abraham, then ninety-nine years old, to re-establish and expand the Abrahamic covenant, introducing the sign of circumcision and renaming Abraham and Sarah, signifying their new roles in His grand plan (Genesis 17:1-8). Crucially, God had just promised Abraham that Sarah, despite her advanced age and barrenness, would bear him a son (Genesis 17:16). Genesis 17:21, therefore, functions as the divine clarification and firm reiteration of the specific lineage through which the covenant would proceed, leaving no room for human alternatives or doubts.
Historical & Cultural Context
In the ancient Near East, the concept of an heir was paramount, especially for a patriarch like Abraham, whose legacy and future depended entirely on progeny. Barrenness was considered a great shame and a significant obstacle to fulfilling divine promises of numerous descendants. The practice of having children through a servant (like Hagar) was a culturally accepted, though secondary, means of obtaining an heir when the primary wife was barren. Abraham's initial laughter and suggestion of Ishmael as the covenant heir (Genesis 17:17-18) must be understood within this cultural framework, where a natural, existing son seemed a more logical and immediate fulfillment than a miraculous birth to an elderly, barren woman. God's declaration in Genesis 17:21 directly challenges these cultural norms and human expectations, asserting a divine logic that transcends natural limitations.
Key Themes
Genesis 17:21 powerfully contributes to several overarching themes within Genesis and the broader biblical narrative. It highlights Divine Sovereignty and Election, demonstrating that God's choice of heir is not based on human merit or natural succession but on His own specific, unchangeable will. It underscores God's Faithfulness to His Promises, even when those promises seem humanly impossible, as seen in the miraculous birth of Isaac. The theme of Divine Timing is also central, with the phrase "at this set time in the next year" emphasizing God's meticulous orchestration of events, ensuring His promises are fulfilled precisely when and how He intends. This verse also sets the stage for the theme of Covenantal Lineage, establishing the specific line through which God's redemptive plan will unfold, distinguishing Isaac's descendants as the chosen people, leading ultimately to the Messiah (Genesis 22:18).
Exposition and Analysis
Genesis 17:21 serves as God's clear and final word regarding the heir of the covenant, directly addressing Abraham's human inclination to consider Ishmael. This declaration leaves no room for doubt, highlighting God's unchangeable purpose and His meticulous orchestration of events. The phrase "which Sarah shall bear unto thee" reiterates the miraculous nature of Isaac's birth, emphasizing that this son will be from Sarah, fulfilling the earlier promise despite her advanced age and barrenness.
Key Word Analysis
Derived from a root meaning "to cut," signifying a compact or agreement often made by passing between pieces of flesh, symbolizing the solemnity and binding nature of the oath. In this context, it refers to God's unilateral, binding promise to Abraham, specifically concerning the lineage through which His redemptive plan would unfold. The emphasis is on God's initiative and unwavering commitment to this sacred bond.
A primitive root meaning "to rise," but in various applications, including to confirm, continue, decree, or make sure. Here, it denotes God's active and certain intention to bring His covenant to fruition through Isaac, making it firm and enduring. It conveys a sense of divine resolve and the unshakeable foundation of God's word.
Refers to an appointment, a fixed time or season, specifically a festival or a divinely designated moment. This word emphasizes that Isaac's birth was not a random or natural occurrence but a precise, pre-ordained event within God's meticulously planned timeline. It underscores God's control over all circumstances and His perfect timing in fulfilling His promises.
Verse Breakdown
"But my covenant will I establish with Isaac"
This opening clause serves as a direct and emphatic contrast ("But") to Abraham's previous suggestion concerning Ishmael (Genesis 17:18). God explicitly names Isaac as the sole heir through whom the Abrahamic covenant will be confirmed and perpetuated. The use of "my covenant" highlights God's ownership and sovereign determination of its terms and lineage, not subject to human preference or natural expectation. The verb "establish" (H6965) signifies God's firm resolve and the unalterable nature of this divine decree.
"which Sarah shall bear unto thee at this set time in the next year"
This second clause provides the miraculous detail and precise timing of Isaac's birth. By specifying "Sarah shall bear," God reiterates that the promised son will come from Abraham's primary wife, despite her age and barrenness, underscoring the supernatural nature of the event. The phrase "at this set time in the next year" (H4150, H312, H8141) is crucial, indicating a divinely appointed and exact moment for the fulfillment of the promise. This precision emphasizes God's omnipotence and faithfulness, demonstrating His control over time and biological processes, ensuring the birth is a clear act of His miraculous power.
Literary Devices
The verse employs several significant literary devices. Contrast is immediately evident in the opening "But," which sharply distinguishes God's divine plan from Abraham's human suggestion regarding Ishmael, highlighting the difference between human logic and divine sovereignty. Emphasis is achieved through the direct naming of Isaac and the firm declaration "my covenant will I establish," underscoring the unchangeable nature of God's word. There is also clear Foreshadowing of a miraculous birth, setting the stage for the narrative of Isaac's conception and birth as a testament to God's power over natural limitations. The precise temporal marker, "at this set time in the next year," functions as a form of Prophetic Specificity, adding weight and certainty to the divine promise, which will be literally fulfilled, further emphasizing God's meticulous planning and absolute control.
Theological and Thematic Connections
Genesis 17:21 is a profound theological statement on God's unwavering sovereignty and faithfulness in the execution of His redemptive plan. It unequivocally declares that God's covenant promises are not subject to human reasoning, natural limitations, or alternative suggestions, but will be fulfilled precisely according to His divine will and timing. This verse establishes the principle of divine election, where God sovereignly chooses the means and the lineage through which His purposes will be accomplished, demonstrating that His grace precedes and transcends human effort or merit. It underscores that the Abrahamic covenant, with its promise of a great nation and a blessing to all families of the earth, would proceed through a divinely chosen, miraculous line, setting the stage for the entire history of Israel and the ultimate coming of the Messiah.
Reflection and Application
Genesis 17:21 offers a powerful and enduring lesson for believers today: God's plans and promises are steadfast, certain, and will be fulfilled according to His perfect timing, regardless of human limitations, doubts, or our own alternative suggestions. This verse challenges us to cultivate unwavering trust in God's specific will, even when circumstances seem impossible, when our own desires might conflict with His revealed purpose, or when His methods defy our human logic. It reinforces the truth that God's word does not return to Him empty but accomplishes His intended purpose (Isaiah 55:11). We are called to align our expectations with God's declarations, knowing that His promises are "Yes" and "Amen" in Christ (2 Corinthians 1:20). This passage encourages us to surrender our limited understanding and trust in the omniscient, omnipotent God who orchestrates all things for His glory and our good.
Questions for Reflection
FAQ
Why did Abraham suggest Ishmael if God had already promised a son through Sarah?
Abraham's suggestion in Genesis 17:18 reflects a deeply human tendency to try and "help" God fulfill His promises through conventional and seemingly more plausible means, especially when the divine method appears impossible. Despite God's explicit promise of a son through Sarah in Genesis 17:16, Abraham, at ninety-nine years old, and Sarah, at ninety and barren, found it incredibly difficult to believe in a miraculous birth. His laughter (Genesis 17:17) and subsequent plea for Ishmael stemmed from a mixture of human doubt, a natural concern for his existing son, and perhaps a desire to see the covenant fulfilled through the most obvious, albeit humanly limited, means. God's response in Genesis 17:21 serves to clarify that His plan transcends human logic and capability, requiring a supernatural intervention.
What is the significance of "at this set time in the next year"?
This phrase, translating the Hebrew mo'ed (H4150), emphasizes God's precise and sovereign timing. It signifies a divinely appointed moment, not a random occurrence or a natural progression. Its profound significance lies in demonstrating God's meticulous planning and exact execution of His will, ensuring that Isaac's birth was not merely a late-life conception but a miraculous event orchestrated by God Himself. This specific timing highlights that God's promises are not only certain to be fulfilled but also fulfilled at His perfect, pre-ordained moment, often transcending human expectations and limitations. This divine precision underscores God's omnipotence, His faithfulness, and His complete control over all circumstances, including the biological and temporal.
Does this verse mean God rejected Ishmael?
Genesis 17:21 does not imply God rejected Ishmael as a person or withheld His blessing from him. Rather, it clarifies that the specific covenant promises concerning the lineage of the Messiah and the chosen nation would be established exclusively through Isaac, not Ishmael. God had already promised to bless Ishmael abundantly, making him fruitful and the father of twelve princes, and forming him into a great nation (Genesis 17:20). Therefore, while Ishmael received significant and lasting blessings, he was not the heir through whom the specific covenant of promise, leading directly to Christ and the nation of Israel, would be fulfilled. This distinction is crucial for understanding the separate destinies of the two lines.
Christ-Centered Fulfillment
Genesis 17:21, by definitively establishing the covenant through Isaac, is profoundly Christ-centered, serving as a powerful foreshadowing of God's ultimate redemptive plan in Jesus Christ. Isaac, born miraculously to elderly, barren parents as the "child of promise" (Romans 9:7-9), stands as a type of Christ, the ultimate Seed through whom all God's promises are fulfilled. Just as Isaac was the divinely chosen heir, not born of natural strength or human will but by God's supernatural intervention (Galatians 4:23), so too is Christ the unique Son, conceived by the Holy Spirit, through whom the new covenant is established (Luke 1:35). This verse highlights the sovereign, elective grace of God in choosing a specific lineage through which His redemptive plan would unfold, culminating in the person and work of Jesus Christ, the true heir of all promises (Galatians 3:16) and the one through whom all nations are truly blessed and brought into covenant relationship with God (Ephesians 2:12-13). The miraculous birth of Isaac points forward to the even greater miracle of the Incarnation, where God Himself entered human history to fulfill His covenant promises in the person of Jesus.