Genesis 21:1-8

11Then the Lord took note of Sarah as He had said, and the Lord did for Sarah as He had 2promised. 23So Sarah conceived and bore a son to Abraham in his old age, at 4the appointed time of which God had spoken to him. 3Abraham called the name of his son who was born to him, whom Sarah bore to him, 5Isaac. 4Then Abraham circumcised his son Isaac when he was 6eight days old, as God had commanded him. 5Now Abraham was 7one hundred years old when his son Isaac was born to him. 6Sarah said, “God has made 8laughter for me; everyone who hears will laugh 9with me.” 7And she said, “10Who would have said to Abraham that Sarah would nurse children? Yet I have borne him a son in his old age.”

8The child grew and was weaned, and Abraham made a great feast on the day that Isaac was weaned.