Genesis 17:10-12

New Century Version

¹⁰ This is my agreement with you and all your descendants, which you must obey: Every male among you must be circumcised. ¹¹ Cut away your foreskin to show that you are prepared to follow the agreement between me and you. ¹² From now on when a baby boy is eight days old, you will circumcise him. This includes any boy born among your people or any who is your slave, who is not one of your descendants.