Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear?
And after that came forth his brother, and his hand had hold on Esau's heel; and his name was called Jacob: and Isaac was threescore years old when she bare them.
And without being weakened in faith he considered his own body now as good as dead (he being about a hundred years old), and the deadness of Sarah's womb: