By faith also Sara herself, being barren, received strength to conceive seed, even past the time of age; because she believed that he was faithful who had promised,
And he gave him the covenant of circumcision, and so he begot Isaac, and circumcised him the eighth day; and Isaac begot Jacob; and Jacob the twelve patriarchs.
And he said to him: I will return and come to thee at this time, life accompanying; and Sara thy wife shall have a son. Which when Sara heard, she laughed behind the door of the tent.
And God said to Abraham: Sara, thy wife, shall bear thee a son; and thou shalt call his name Isaac. And I will establish my covenant with him for a perpetual covenant, and with his seed after him.