Genesis 17:9-11

New Catholic Bible

⁹ God said to Abraham, “On your part, you must observe my covenant, you and your descendants after you, for all time. 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.