11. Cut away the foreskin to show that you follow the agreement between me and you.
12. From now on when a baby boy is eight days old, you will circumcise him. This includes any boy born among your people or any who is your slave. (He would not be one of your descendants.)
13. So circumcise every baby boy. Circumcise him whether he is born in your family or bought as a slave. Your bodies will be marked. This will show that you are part of my agreement that lasts forever.
14. Any male who is not circumcised will be separated from his people. He has broken my agreement.”
15. God said to Abraham, “I will change the name of Sarai, your wife. 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 nations. Kings of nations will come from her.”
17. Abraham bowed facedown on the ground and laughed. He said to himself, “Can a man have a child when he is 100 years old? Can Sarah give birth to a child when she is 90?”
18. Then Abraham said to God, “Please let Ishmael be the son you promised.”
19. God said, “No. Sarah your wife will have a son, and you will name him Isaac. I will make my agreement with him. It will be an agreement that continues forever with all his descendants.
20. “You asked me about Ishmael, and I heard you. I will bless him. I will give him many descendants. And I will cause their numbers to grow very greatly. He will be the father of 12 great leaders. I will make him into a great nation.
21. But I will make my agreement with Isaac. He is the son whom Sarah will have at this same time next year.”