Genesis 17:15-17

15Then God said to Abraham, “As for Sarai your wife, you shall not call her name Sarai, but 1Sarah shall be her name.

16I will bless her, and indeed I will give you 2a son by her. Then I will bless her, and she shall be a mother of nations; 3kings of peoples will 4come from her.”

17Then Abraham 5fell on his face and laughed, and said in his heart, “Will a child be born to a man one hundred years old? And 6will Sarah, who is ninety years old, bear a child?”