God said, “No, Sarah your wife will have a son, and you will name him Isaac. I will make my agreement with him to be an agreement that continues forever with all his descendants.
Stay in this land, and I will be with you and bless you. I will give you and your descendants all these lands, and I will keep the oath I made to Abraham your father.
He was too old to have children, and Sarah could not have children. It was by faith that Abraham was made able to become a father, because he trusted God to do what he had promised.
When the rainbow appears in the clouds, I will see it and I will remember the agreement that continues forever between me and every living thing on the earth.”