Romans 2:25-27

You trust in the covenant sign of circumcision, yet circumcision only has value if you faithfully keep the teachings of the law. But if you violate the law, you have invalidated your circumcision. And if the uncircumcised one faithfully keeps the law, won’t his obedience make him more “Jewish” than the actual rite of circumcision? And won’t the one who has never had the knife cut his foreskin be your judge when you break the law?