Then Avraham 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 being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sarah's womb:
And after that came his brother out, and his hand took hold on Esav's heel; and his name was called Yaakov: and Yitzchak was threescore years old when she bare them.