Genesis 17:11-13

New Century Version

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. ¹³ Circumcise every baby boy whether he is born in your family or bought as a slave. Your bodies will be marked to show that you are part of my agreement that lasts forever.