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.”