17 Then Abraham fell on his face and laughed and said in his heart, “Shall a child be born to a man that is a hundred years old? Shall Sarah, who is ninety years old, bear a child?”
18 Abraham said to God, “Oh, that Ishmael might live before You!”
19 Then God said, “No, but your wife Sarah will bear you a son, and you will call his name Isaac. I will establish My covenant with him as an everlasting covenant and with his descendants after him.
20 And as for Ishmael, I have heard you. I have blessed him, and will make him fruitful and will multiply him exceedingly. He will be the father of twelve princes, and I will make him a great nation.
21 But I will establish My covenant with Isaac, whom Sarah will bear to you at this set time next year.”
22 Then He stopped talking with Abraham, and God went up from him.
23 Then Abraham took Ishmael, his son, and all that were born in his house, and all that were bought with his money, every male among the men of Abraham’s household, and circumcised the flesh of their foreskins that very same day as God had said to him.