Then God said to Abraham, "As for Sarai your wife, you shall not call her name Sarai, but Sarah [shall be] her name.
"I will bless her, and indeed I will give you a son by her. Then I will bless her, and she shall be [a mother of] nations; kings of peoples will come from her."
Then Abraham fell on his face and laughed, and said in his heart, "Will a child be born to a man one hundred years old? And will Sarah, who is ninety years old, bear [a child]?"
And Abraham said to God, "Oh that Ishmael might live before You!"
But God said, "No, but Sarah your wife will bear you a son, and you shall call his name Isaac; and I will establish My covenant with him for an everlasting covenant for his descendants after him.