Genesis 21:1-6 WEB

1 Yahweh visited Sarah as he had said, and Yahweh did to Sarah as he had spoken.
2 Sarah conceived, and bore Abraham a son in his old age, at the set time of which God had spoken to him.
3 Abraham called his son who was born to him, whom Sarah bare to him, Isaac.
4 Abraham circumcised his son, Isaac, when he was eight days old, as God had commanded him.
5 Abraham was one hundred years old when his son, Isaac, was born to him.
6 Sarah said, "God has made me laugh. Everyone who hears will laugh with me."