Genesis 17:10-12

New Catholic Bible

¹⁰ This is my covenant that you must observe, a covenant between me and your descendants after you: every male among you must be circumcised. 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.