Genesis 21:1-7

1And the Lord visited Sarah as He had said, and the Lord did for Sarah as He had spoken.

2For Sarah conceived and bore Abraham a son in his old age, at the set time of which God had spoken to him.

3And Abraham called the name of his son who was born to him—whom Sarah bore to him—Isaac.

4Then Abraham circumcised his son Isaac when he was eight days old, as God had commanded him.

5Now Abraham was one hundred years old when his son Isaac was born to him.

6And Sarah said, “God has made me laugh, and all who hear will laugh with me.”

7She also said, “Who would have said to Abraham that Sarah would nurse children? For I have borne him a son in his old age.”