Rom 2:17-25 : 17 Now you, if you call yourself a Jew, and rely on the law and boast in God,
18 and know His will and approve things that are excellent, being instructed from the law,
19 and are convinced that you are a guide for the blind, a light for those in darkness,
20 an instructor of the foolish, a teacher of children, having in the law the form of knowledge and truth—
21 You then, who teach others, do you not teach yourself? You who preach against stealing, do you steal?
22 You who say that people should not commit adultery, do you commit adultery? You who abhor idols, do you rob temples?
23 You who boast in the law, do you dishonor God by breaking the law?
24 For as it is written, 'The name of God is blasphemed among the Gentiles because of you.'
25 Circumcision indeed has value if you obey the law, but if you are a lawbreaker, your circumcision has become uncircumcision.