13. Any male who is born in your house or bought with your money must be circumcised. "My covenant will last forever. Your body will have the mark of my covenant on it.
14. "Any male who has not been circumcised will be cut off from his people. He has broken my covenant."
15. God also said to Abraham, "As for Sarai your wife, do not call her Sarai anymore. Her name will be Sarah.
16. I will give her my blessing. You can be sure that I will give you a son by her. I will bless her so that she will be the mother of nations. Kings of nations will come from her."
17. Abraham fell with his face to the ground. He laughed and said to himself, "Will a son be born to a man who is 100 years old? Will Sarah have a child at the age of 90?"
18. Abraham said to God, "I wish Ishmael could receive your blessing!"
19. Then God said, "I will bless Ishmael. But your wife Sarah will have a son by you. And you will name him Isaac. I will establish my covenant with him. It will be a covenant that lasts forever. It will be for Isaac and for his family after him.
20. "As for Ishmael, I have heard you. You can be sure that I will bless him. I will give him children. I will greatly increase his numbers. He will be the father of 12 rulers. And I will make him into a great nation.
21. "But I will establish my covenant with Isaac. By this time next year, Sarah will have a son by you."
22. When he had finished speaking with Abraham, God left him.
23. On that very day Abraham circumcised his son Ishmael. He also circumcised every male who was born in his house or bought with his money. He did exactly as God had told him.