And Sarah my master’s wife bare a son to my master when she was old: and unto him hath he given all that he hath.
And Abraham gave all that he had unto Isaac.
Wherefore she said unto Abraham, Cast out this handmaid and her son: for the son of this handmaid shall not be heir with my son, even with Isaac.
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;