Genesis 17:15-19 Common English Bible (CEB)
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.[a] I will set up my covenant with him and with his descendants after him as an enduring covenant.