Through faith also Sarah herself received strength to conceive seed, and was delivered of a child when she was past age, because she judged him faithful who had promised.
And he gave him the covenant of circumcision: and so Avraham begat Yitzchak, and circumcised him the eighth day; and Yitzchak begat Yaakov; and Yaakov begat the twelve patriarchs.
And he said, I will certainly return unto thee according to the time of life; and, lo, Sarah thy wife shall have a son. And Sarah heard it in the tent door, which was behind him.
And Elohim said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Yitzchak: and I will establish my covenant with him for an everlasting covenant, and with his seed after him.
And I took your father Avraham from the other side of the flood, and led him throughout all the land of Kenaan, and multiplied his seed, and gave him Yitzchak.