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The Promise Extends to Sarah

Genesis 17:15-27 presents a pivotal moment in God’s covenant with Abraham, emphasizing the specificity of His promise and its miraculous nature. God turned His attention to Sarah, declaring, “As for Sarai your wife, you shall not call her name Sarai, but Sarah shall be her name. I will bless her, and moreover, I will give you a son by her. I will bless her, and she shall become nations; kings of peoples shall come from her” (Genesis 17:15-16). The change of her name from Sarai, which can mean “contentious,” to Sarah, meaning “princess,” highlighted her role as the mother of a covenantal lineage through which nations and royalty would emerge.

This announcement revealed that God’s covenant was not limited to Abraham alone but extended to Sarah as an integral participant. By emphasizing her role, Jehovah affirmed that His purposes were not dependent on human intervention or alternative plans, as seen in the earlier birth of Ishmael through Hagar. Sarah would bear the son of promise, demonstrating the sovereignty of Jehovah and His power to fulfill His word despite human limitations.

Abraham’s Reaction and God’s Reassurance

Upon hearing this remarkable promise, Abraham “fell on his face and laughed and said to himself, ‘Shall a child be born to a man who is a hundred years old? Shall Sarah, who is ninety years old, bear a child?’” (Genesis 17:17). Abraham’s laughter was not an expression of doubt but amazement at the sheer impossibility of such an event from a human perspective. His reaction underscores the extraordinary nature of the covenant and the miraculous intervention required to bring it to fruition.

In response, Abraham pleaded for Ishmael, saying, “Oh that Ishmael might live before you!” (Genesis 17:18). This plea reveals Abraham’s affection for Ishmael and his desire for the boy to partake in God’s blessings. However, Jehovah clarified that while Ishmael would indeed be blessed, the covenant would be established through the child to be born of Sarah: “But I will establish my covenant with Isaac, whom Sarah shall bear to you at this time next year” (Genesis 17:19-21). This distinction underscores the exclusivity of God’s covenant and His predetermined plan to bring forth a specific lineage through Isaac.

The Significance of Ishmael’s Blessing

Although Ishmael was not the child of promise, God did not overlook him. Jehovah declared, “I have blessed him and will make him fruitful and multiply him greatly. He shall father twelve princes, and I will make him into a great nation” (Genesis 17:20). Ishmael’s blessing reflects Jehovah’s compassion and His broader purposes for all humanity. However, the covenant blessings—centered on the land, the promise of descendants, and the spiritual seed—were reserved for Isaac and his descendants.

This differentiation between Ishmael and Isaac illustrates a key theological truth: the covenant with Abraham was not based on human schemes or effort but on God’s sovereign choice. Ishmael’s birth was the result of human planning, while Isaac’s birth would be a supernatural act of grace. This contrast foreshadows the New Testament teaching that salvation is by grace and not by works, as Paul elaborates in Romans 9:6-8, “It is not the children of the flesh who are the children of God, but the children of the promise are counted as offspring.”

The Immediate Obedience of Abraham

After Jehovah concluded His dialogue with Abraham, the patriarch demonstrated his faith through prompt obedience. The text states, “Then Abraham took Ishmael his son and all those born in his house or bought with his money, every male among the men of Abraham’s house, and he circumcised the flesh of their foreskins that very day, as God had said to him” (Genesis 17:23). This act of immediate compliance reflects Abraham’s trust in Jehovah and his recognition of the covenant’s sacredness.

Significantly, this obedience extended to Ishmael, who was thirteen years old at the time (Genesis 17:25), and all the males in Abraham’s household, including slaves. This inclusion of everyone in Abraham’s household underscores the communal nature of the covenant and its unifying effect on all who were under his care. It also highlights the requirement of submission to Jehovah’s commands as a sign of belonging to the covenant community.

The Miraculous Nature of Isaac’s Birth

Jehovah’s insistence that Sarah would bear the child of promise reinforces the miraculous nature of His plan. Sarah’s advanced age and previous barrenness made her an unlikely candidate to bear a child, yet Jehovah’s promise transcended natural limitations. This act of divine power served as a testament to His ability to fulfill His purposes regardless of human frailty. The birth of Isaac would stand as a symbol of God’s faithfulness and the certainty of His promises.

The name Isaac, meaning “he laughs,” memorialized Abraham’s initial reaction of astonishment and joy at the promise. It also foreshadowed the joy that his birth would bring, not only to Abraham and Sarah but to future generations who would witness the fulfillment of God’s covenant.

Theological Implications of the Covenant with Isaac

The covenant with Isaac carries profound theological significance. By specifying Isaac as the child through whom the covenant would continue, Jehovah affirmed His sovereignty in choosing the line through which His redemptive purposes would unfold. This election was not based on merit or human effort but on His divine will. As Paul writes in Galatians 4:28, “Now you, brothers, like Isaac, are children of promise.”

Isaac’s role in the covenant also underscores the centrality of faith in receiving God’s blessings. Abraham’s belief in Jehovah’s promise, despite its seeming impossibility, was credited to him as righteousness (Genesis 15:6). Similarly, the continuation of the covenant through Isaac emphasized reliance on God’s grace rather than human initiative.

Foreshadowing of Christ

The birth of Isaac as the son of promise serves as a foreshadowing of the ultimate fulfillment of Jehovah’s covenant in Jesus Christ. Just as Isaac’s birth was a miraculous event, so too was the birth of Christ, conceived by the Holy Spirit and born of the virgin Mary. Furthermore, the promise that through Abraham’s offspring “all the nations of the earth shall be blessed” (Genesis 22:18) finds its ultimate realization in Jesus, the Messiah.

Paul elaborates on this connection in Galatians 3:16, stating, “Now the promises were made to Abraham and to his offspring. It does not say, ‘And to offsprings,’ referring to many, but referring to one, ‘And to your offspring,’ who is Christ.” Thus, the covenant with Abraham, reaffirmed through Isaac, points to the redemptive work of Christ, through whom all people may partake of the blessings of salvation.

Genesis 17:15-27 reveals Jehovah’s unwavering commitment to His covenant with Abraham, demonstrating His sovereign choice and power to fulfill His promises. The promise of a son through Sarah, despite her barrenness, highlights the miraculous nature of the covenant and the centrality of faith in receiving God’s blessings. The distinction between Isaac, the son of promise, and Ishmael, the son of human effort, underscores the theological truth that God’s purposes are accomplished by His grace and not by human initiative.

Through Abraham’s obedience in circumcising himself, Ishmael, and his entire household, the covenant was visibly affirmed, setting apart Abraham’s descendants as Jehovah’s chosen people. This covenantal relationship would ultimately culminate in the birth of Jesus Christ, the true seed of Abraham, through whom all nations would be blessed.

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About the Author

EDWARD D. ANDREWS (AS in Criminal Justice, BS in Religion, MA in Biblical Studies, and MDiv in Theology) is CEO and President of Christian Publishing House. He has authored over 220+ books. In addition, Andrews is the Chief Translator of the Updated American Standard Version (UASV).