12. An infant of eight days will be circumcised among you, every male in your generations. So also servants born to you, as well as those bought, shall be circumcised, even those who are not of your stock.
13. And my covenant shall be with your flesh as an eternal covenant.
14. The male, the flesh of whose foreskin will not be circumcised, that soul shall be eliminated from his people. For he has made my covenant void."
15. God said also to Abraham: "Your wife Sarai, you shall not call Sarai, but Sarah.
16. And I will bless her, and from her I will give you a son, whom I will bless, and he will be among the nations, and the kings of the peoples will rise from him."
17. Abraham fell on his face, and he laughed, saying in his heart: "Do you think a son can be born to a one hundred year old man? And will Sarah give birth at the age of ninety?"
18. And he said to God, "If only Ishmael would live in your sight."
19. And God said to Abraham: "Your wife Sarah shall give birth to a son, and you shall call his name Isaac, and I will establish my covenant with him as a perpetual covenant, and with his offspring after him.