Genesis 17:15-18

God said to Abraham, “I will change the name of Sarai, your wife, to Sarah. I will bless her and give her a son, and you will be the father. She will be the mother of many nations. Kings of nations will come from her.” Abraham bowed facedown on the ground and laughed. He said to himself, “Can a man have a child when he is a hundred years old? Can Sarah give birth to a child when she is ninety?” Then Abraham said to God, “Please let Ishmael be the son you promised.”