Romans 2:20-28

an instructor of the foolish, a teacher of little children, because you have in the law the embodiment of knowledge and truth— you, then, who teach others, do you not teach yourself? You who preach against stealing, do you steal? You who say that people should not commit adultery, do you commit adultery? You who abhor idols, do you rob temples? You who boast in the law, do you dishonor God by breaking the law? As it is written: “God’s name is blasphemed among the Gentiles because of you.” Circumcision has value if you observe the law, but if you break the law, you have become as though you had not been circumcised. So then, if those who are not circumcised keep the law’s requirements, will they not be regarded as though they were circumcised? The one who is not circumcised physically and yet obeys the law will condemn you who, even though you have the written code and circumcision, are a lawbreaker. A person is not a Jew who is one only outwardly, nor is circumcision merely outward and physical.