11. You must circumcise the flesh of your foreskins, and it will be a symbol of the covenant between us.
12. On the eighth day after birth, every male in every generation must be circumcised, including those who are not your own children: those born in your household and those purchased with silver from foreigners.
13. Be sure you circumcise those born in your household and those purchased with your silver. Your flesh will embody my covenant as an enduring covenant.
14. Any uncircumcised male whose flesh of his foreskin remains uncircumcised will be cut off from his people. He has broken my covenant."
15. God said to Abraham, "As for your wife Sarai, you will no longer call her Sarai. Her name will now be Sarah.
16. I will bless her and even give you a son from her. I will bless her so that she will become nations, and kings of peoples will come from her."
17. Abraham fell on his face and laughed. He said to himself, Can a 100-year-old man become a father, or Sarah, a 90-year-old woman, have a child?
18. To God Abraham said, "If only you would accept Ishmael!"
19. But God said, "No, your wife Sarah will give birth to a son for you, and you will name him Isaac. I will set up my covenant with him and with his descendants after him as an enduring covenant.
20. As for Ishmael, I’ve heard your request. I will bless him and make him fertile and give him many, many descendants. He will be the ancestor of twelve tribal leaders, and I will make a great nation of him.
21. But I will set up my covenant with Isaac, who will be born to Sarah at this time next year.”