9. Then God said to Abraham, “Now, this is your part of the agreement: You and all your descendants will obey my agreement.
10. This is my agreement that all of you must obey. This is the agreement between me and you and all your descendants. Every male must be circumcised.
11. You will cut the skin to show that you follow the agreement between me and you.
12. When the baby boy is eight days old, you will circumcise him. Every boy born among your people and every boy who is a slave of your people must be circumcised.
13. So every baby boy in your nation will be circumcised. Every boy who is born from your family or bought as a slave will be circumcised.
14. Abraham, this is the agreement between you and me: Any male who is not circumcised will be cut off from his people because he has broken my agreement.”
15. God said to Abraham, “I will give Sarai, your wife, a new name. Her new name will be Sarah.
16. I will bless her. I will give her a son, and you will be the father. She will be the mother of many new nations. Kings of nations will come from her.”
17. Abraham bowed his face to the ground to show he respected God. But he laughed and said to himself, “I am 100 years old. I cannot have a son, and Sarah is 90 years old. She cannot have a child.”
18. Then Abraham said to God, “I hope Ishmael will live and serve you.”
19. God said, “No, I said that your wife Sarah will have a son. You will name him Isaac. I will make my agreement with him that will continue forever with all his descendants.
20. “You mentioned Ishmael, and I heard you. I will bless him, and he will have many children. He will be the father of twelve great leaders. His family will become a great nation.