Romans 2:29
But the true Jew is one inwardly, and true circumcision is heart-circumcision--not literal, but spiritual; and such people receive praise not from men, but from God.
Romans 4:11
Before, not after. And he received circumcision as a sign, a mark attesting the reality of the faith-righteousness which was his while still uncircumcised, that he might be the forefather of all those who believe even though they are uncircumcised--in order that this righteousness might be placed to their credit;
Colossians 2:11
In Him also you were circumcised with a circumcision not performed by hand, when you threw off your sinful nature in true Christian circumcision;