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.
Then the Lord said, “I will certainly return to you about this time a year from now. At that time your wife Sarah will have a son.” Sarah was listening at the entrance of the tent which was behind him.
Now Elizabeth, your relative, is also pregnant with a son though she is very old. Everyone thought she could not have a baby, but she has been pregnant for six months.
God made an agreement with Abraham, the sign of which was circumcision. And so when Abraham had his son Isaac, Abraham circumcised him when he was eight days old. Isaac also circumcised his son Jacob, and Jacob did the same for his sons, the twelve ancestors of our people.
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.
But I, the Lord, took your ancestor Abraham from the other side of the river and led him through the land of Canaan. And I gave him many children, including his son Isaac.