Romans 2:29
And the real circumcision is the circumcision of the heart, a spiritual and not a literal thing. Such a man wins praise from God, though not from men.
Romans 4:11
Not after, but before. And it was as a sign of this that he received the rite of circumcision-to attest the righteousness due to the faith of an uncircumcised man-in order that he might be the father of all who have faith in God even when uncircumcised, that they also may be regarded by God as righteous;
Colossians 2:11
By your union with him you received a circumcision that was not performed by human hands, when you threw off the tyranny of the earthly body, and received the circumcision of the Christ.