Reference

Genesis 21:3

And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac.
1

And the Lord visited Sarah as he had said, and the Lord did unto Sarah as he had spoken.

2

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

3

And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac.

4

And Abraham circumcised his son Isaac being eight days old, as God had commanded him.

5

And Abraham was an hundred years old, when his son Isaac was born unto him.