Genesis 17:15-17

Revised Standard Version

¹⁵ And God said to Abraham, “As for Sar′ai your wife, you shall not call her name Sar′ai, but Sarah shall be her name. ¹⁶ I will bless her, and moreover I will give you a son by her; 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 to himself, “Shall a child be born to a man who is a hundred years old? Shall Sarah, who is ninety years old, bear a child?”