Romans 2:29
The real Jew is the man who is one inwardly, and real circumcision is a matter of the heart, a spiritual, not a literal, thing. Such a man receives his praise not from men, but from God.
Romans 4:11
and he was afterward given the mark of circumcision as the stamp of God's acknowledgment of the uprightness based on faith that was his before he was circumcised, so that he should be the forefather of all who, without being circumcised, have faith and so are credited with uprightness,
Colossians 2:11
Through your relation to him you have received not a physical circumcision, but a circumcision effected by Christ, in stripping you of your material nature,