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?”
Afterward his brother came forth, and his hand had taken hold of Esau's heel; so his name was called Jacob. Isaac was sixty years old when she bore them.
He did not weaken in faith when he considered his own body, which was as good as dead because he was about a hundred years old, or when he considered the barrenness of Sarah's womb.