15. And God said to Abraham, As for Sarai your wife, you shall not call her name Sarai; but Sarah [Princess] her name shall be.
16. And I will bless her and give you a son also by her. Yes, I will bless her, and she shall be a mother of nations; kings of peoples shall come from her.
17. Then Abraham fell on his face and laughed and said in his heart, Shall a child be born to a man who is a hundred years old? And shall Sarah, who is ninety years old, bear a son?
18. And [he] said to God, Oh, that Ishmael might live before You!
19. But God said, Sarah your wife shall bear you a son indeed, and you shall call his name Isaac [laughter]; and I will establish My covenant or solemn pledge with him for an everlasting covenant and with his posterity after him.
20. And as for Ishmael, I have heard and heeded you: behold, I will bless 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. [Fulfilled in Gen. 25:12-18.]
21. But My covenant, My promise and pledge, I will establish with Isaac, whom Sarah will bear to you at this season next year.
22. And God stopped talking with him and went up from Abraham.
23. And Abraham took Ishmael his son and all who were born in his house and all who were bought with his money, every male among [those] of Abraham's house, and circumcised [them] the very same day, as God had said to him.