God said to Abraham, “Every son in each family must be circumcised to show you have kept your agreement with me.” So when Isaac was eight days old, Abraham circumcised him. Later, Isaac circumcised his son Jacob, and Jacob circumcised his twelve sons.
Your relative Elizabeth is also going to have a son, even though she is old. No one thought she could ever have a baby, but in three months she will have a son.
One of the guests was the Lord, and he said, “I'll come back about this time next year, and when I do, Sarah will already have a son.” Sarah was behind Abraham, listening at the entrance to the tent.
But your son Isaac will be born about this time next year, and the promise I am making to you and your family will be for him and his descendants forever.
But I brought Abraham across the Euphrates River and led him through the land of Canaan. I blessed him by giving him Isaac, the first in a line of many descendants.