Thematic Bible: The real heir born

And Jehovah hath looked after Sarah as He hath said, and Jehovah doth to Sarah as He hath spoken; and Sarah conceiveth, and beareth a son to Abraham, to his old age, at the appointed time that God hath spoken of with him; and Abraham calleth the name of his son who is born to him, whom Sarah hath born to him -- Isaac; read more.
and Abraham circumciseth Isaac his son, being a son of eight days, as God hath commanded him. And Abraham is a son of a hundred years in Isaac his son being born to him, and Sarah saith, 'God hath made laughter for me; every one who is hearing laugheth for me.' She saith also, 'Who hath said to Abraham, Sarah hath suckled sons, that I have born a son for his old age?'