Genesis 17:9-22

9Then God said to Abraham, “As for you, you must keep my covenant, you and your descendants after you for the generations to come. 10This is my covenant with you and your descendants after you, the covenant you are to keep: Every male among you shall be circumcised. 11You are to undergo circumcision, and it will be the sign of the covenant between me and you. 12For the generations to come every male among you who is eight days old must be circumcised, including those born in your household or bought with money from a foreigner—those who are not your offspring. 13Whether born in your household or bought with your money, they must be circumcised. My covenant in your flesh is to be an everlasting covenant.

14Any uncircumcised male, who has not been circumcised in the flesh, will be cut off from his people; he has broken my covenant.” 15God also said to Abraham, “As for Sarai your wife, you are no longer to call her Sarai; her name will be Sarah.

16I will bless her and will surely give you a son by her. I will bless her so that she will be the mother of nations; kings of peoples will come from her.” 17Abraham fell facedown; he laughed and said to himself, “Will a son be born to a man a hundred years old? Will Sarah bear a child at the age of ninety?”

18And Abraham said to God, “If only Ishmael might live under your blessing!” 19Then God said, “Yes, but your wife Sarah will bear you a son, and you will call him Isaac. Isaac means he laughs. I will establish my covenant with him as an everlasting covenant for his descendants after him. 20And as for Ishmael, I have heard you: I will surely bless him; I will make him fruitful and will greatly increase his numbers. He will be the father of twelve rulers, and I will make him into a great nation. 21But my covenant I will establish with Isaac, whom Sarah will bear to you by this time next year.”

22When he had finished speaking with Abraham, God went up from him.