Genesis 17:12-14

12For generations to come every male child who is eight days old must be circumcised, whether he is born in your household or bought with money from a foreigner who’s not related to you.

13Every male born in your household or bought with your money is to be circumcised without exception. So my promise will be a sign on your flesh, an everlasting promise.

14Any uncircumcised male must be excluded from his people because he has rejected my promise.”