When Abram was ninety-nine years old, the LORD appeared to him and said, “I am God the Almighty. Walk in my presence and be blameless.”

God also said to Abraham, “On your part, you and your descendants after you must keep my covenant throughout the ages. This is my covenant with you and your descendants after you that you must keep: every male among you shall be circumcised.”

God further said to Abraham, “As for your wife Sarai, do not call her Sarai; her name shall be Sarah. I will bless her, and I will give you a son by her. Him also will I bless; he shall give rise to nations, and rulers of peoples shall issue from him.”

Abraham prostrated himself and laughed as he said to himself, “Can a child be born to a man who is a hundred years old? Or can Sarah give birth at ninety?” Then Abraham said to God, “Let but Ishmael live on by your favor!”

God replied, “Nevertheless, your wife Sarah is to bear you a son, and you shall call him Isaac. I will maintain my covenant with him as an everlasting pact, to be his God and the God of his descendants after him. As for Ishmael, I am heeding you: I hereby bless him. I will make him fertile and will multiply him exceedingly. He shall become the father of twelve chieftains, and I will make of him a great nation. But my covenant I will maintain with Isaac, whom Sarah shall bear to you by this time next year.”

When he had finished speaking with him, God departed from Abraham.