Book of Jubilees 15:19
The Lord said: ‘Very well, but Sarah, too, will give birth to a son for you and you will name him Isaac. I will establish my covenant with him as an eternal covenant and for his descendants after him.
The Lord said: ‘Very well, but Sarah, too, will give birth to a son for you and you will name him Isaac. I will establish my covenant with him as an eternal covenant and for his descendants after him.