Genesis 17:14-20

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.