Genesis · chapter 17 of 50
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Genesis 17 tells how the Lord appears to ninety-nine-year-old Abram as God Almighty and establishes an everlasting covenant with him. He changes his name to Abraham, father of a multitude, and Sarai's to Sarah, and institutes circumcision as the sign. God announces that Sarah will bear Isaac within a year, and Abraham circumcises every male in his household that same day.
Genesis 17 comes thirteen years after Ishmael's birth. God renews in more detail the covenant he had promised in Genesis 12 and 15, and ties it to a visible sign and to new names. The chapter makes clear that the son of the promise will not be Ishmael but a son of Sarah, and shows that the covenant is sustained by God's grace, not by Abraham's strength.
When Abram is ninety-nine years old, the Lord appears to him and says he is God Almighty, and tells him to walk before him and be blameless. Abram falls on his face, and God establishes his covenant with him: he will multiply him greatly, he will be the father of many nations, he will no longer be called Abram but Abraham, and kings will come from him. The covenant will be everlasting, with him and his offspring, to be their God, and he will give them the whole land of Canaan as an everlasting possession.
As the sign of the covenant, every male will be circumcised, and every boy at eight days old, including servants born in the house and those bought with money. Whoever is not circumcised will be cut off from his people, for he has broken the covenant. God also changes the name of Sarai to Sarah, blesses her and says he will give her a son, and she will be a mother of nations and of kings.
Abraham falls on his face and laughs in his heart, thinking of his age and Sarah's. He asks God that Ishmael might live before him. God answers that Sarah will bear him a son, whom he will call Isaac, and with him he will confirm his everlasting covenant. Yet he also blesses Ishmael: he will make him fruitful and he will father twelve princes. The covenant, however, will be with Isaac, who will be born the next year. That same day Abraham circumcises Ishmael, who was thirteen, and all the males of his house, and himself, at ninety-nine.
References follow ESV book names and verse numbers. Read each verse in your Bible before the explanation.
The Lord presents himself to Abram as God Almighty and tells him to walk before him and be blameless. The covenant begins with who God is, not with what Abram does, and its call to faithfulness grows out of that greatness.
God changes Abram's name to Abraham, because he has made him father of many nations. When God gives a new name, he declares beforehand what a person will be, even though Abraham does not yet have the promised son.
God establishes his covenant with Abraham and his offspring as an everlasting covenant, to be their God. The essence of the covenant is relational: God promises to be the God of his people, and that promise will reach all the way to Christ.
God says that Sarah will bear Abraham a son, who will be called Isaac, and that with him he will establish his everlasting covenant. The name, which recalls Abraham's laughter, turns that disbelief into a testimony of what God does.
6 questions with answers and references, ready for Sunday school, small group or a Bible quiz night.
Answer: Ninety-nine years old. — Genesis 17:1
Answer: Abraham, because he would be the father of many nations. — Genesis 17:5
Answer: The circumcision of every male, at eight days old. — Genesis 17:10-12
Answer: Sarah; he would bless her with a son and she would be a mother of nations. — Genesis 17:15-16
Answer: He fell on his face and laughed, thinking of his age and Sarah's. — Genesis 17:17
Answer: He circumcised Ishmael and all the males of his house, and himself. — Genesis 17:23
Genesis 17 shows that God's covenant is based on his initiative. Abraham achieves nothing; he receives. In a group you can reflect on how our identity in Christ, like a new name, does not depend on what we do but on what God has declared about us.
It also highlights Abraham's immediate obedience: that same day he does what God commanded. Ask what command of God you have put off, and what holds you back. And remember that God is not scandalized by our laughter or our doubts: he takes them into account and keeps fulfilling his word.
Genesis 17 ends with Abraham's household marked with the sign of the covenant, awaiting the promised son. In Genesis 18 God will visit Abraham by the oaks of Mamre and repeat the promise to Sarah, who will laugh inside the tent.
It was the visible sign of belonging to the covenant people and of trusting God's promise about offspring. In the New Testament, Romans 4:11 explains that Abraham received it as a seal of the righteousness he already had by faith, and Paul teaches that what matters is the heart.
It translates the Hebrew name El Shaddai, used in Genesis to recall God's power to fulfill promises that seem impossible. That is exactly the context here: a ninety-nine-year-old man and a barren woman receive the promise of a son.
The text does not condemn him. His laughter expresses amazement at the humanly impossible. Unlike Sarah's laughter in the next chapter, Abraham does not stop obeying: he circumcises his household that same day, and Romans 4:19-21 says he did not waver in unbelief.