But I will keep my covenant with your son Isaac, who will be born to Sarah about this time next year."

One of them said, "Nine months from now I will come back, and your wife Sarah will have a son." Sarah was behind him, at the door of the tent, listening.

Is anything too hard for the LORD? As I said, nine months from now I will return, and Sarah will have a son."

and she became pregnant and bore a son to Abraham when he was old. The boy was born at the time God had said he would be born.

It was faith that made Abraham able to become a father, even though he was too old and Sarah herself could not have children. He trusted God to keep his promise.

Though Abraham was practically dead, from this one man came as many descendants as there are stars in the sky, as many as the numberless grains of sand on the seashore.

It was faith that made Abraham offer his son Isaac as a sacrifice when God put Abraham to the test. Abraham was the one to whom God had made the promise, yet he was ready to offer his only son as a sacrifice.