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.
20. Likewise, concerning Ishmael, I have heard you. Behold, I will bless and enlarge him, and I will multiply him greatly. He will produce twelve leaders, and I will make him into a great nation.
21. Yet in truth, I will establish my covenant with Isaac, to whom Sarah will give birth for you at this time next year."
22. And when he had finished speaking with him, God ascended from Abraham.
23. Then Abraham took his son Ishmael, and all who were born in his house, and all whom he had bought, every male among the men of his house, and he circumcised the flesh of their foreskin promptly, the very same day, just as God had instructed him.
24. Abraham was ninety-nine years old when he circumcised the flesh of his foreskin.
25. And his son Ishmael had completed thirteen years at the time of his circumcision.
26. On the very same day, Abraham was circumcised with his son Ishmael.
27. And all the men of his house, those born in his house, as well as those who were bought, even the foreigners, were circumcised with him.