Genesis 17:11-13

New Catholic Bible

¹¹ You shall circumcise the flesh of the male member. This shall be the sign of the covenant between me and you. ¹² Whenever baby boys are eight days old, they will be circumcised, whether they are your own children or the children of those whom you bought and who are foreigners and not of your bloodline. ¹³ You must circumcise those who are born in your house and those who are bought by you. Thus, my covenant will be marked in your flesh as an eternal covenant.