15. God said to Abraham, “You must no longer call your wife Sarai; from now on her name is Sarah.
16. I will bless her, and I will give you a son by her. I will bless her, and she will become the mother of nations, and there will be kings among her descendants.”
17. Abraham bowed down with his face touching the ground, but he began to laugh when he thought, “Can a man have a child when he is a hundred years old? Can Sarah have a child at ninety?”
18. He asked God, “Why not let Ishmael be my heir?”