Genesis 21:1–8
21:1 The LORD visited Sarah as he had said, and the LORD did to Sarah as he had spoken.
21:2 Sarah conceived, and bore Abraham a son in his old age, at the set time of which God had spoken to him.
21:3 Abraham called his son who was born to him, whom Sarah bore to him, Isaac.
21:4 Abraham circumcised his son, Isaac, when he was eight days old, as God had commanded him.
21:5 Abraham was one hundred years old when his son, Isaac, was born to him.
21:6 Sarah said, “God has made me laugh. Everyone who hears will laugh with me.”
21:7 She said, “Who would have said to Abraham that Sarah would nurse children? For I have borne him a son in his old age.”
21:8 The child grew and was weaned. Abraham made a great feast on the day that Isaac was weaned.