Genesis 21:4 KJV
And Abraham circumcised his son Isaac being eight days old, as God had commanded him.
Genesis 21:2–6 KJV Chapter Context
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.
6
And Sarah said, God hath made me to laugh, so that all that hear will laugh with me.