Colossians 2:10
In him also you were circumcised with the circumcision made without hands, by putting off the body of the flesh in the circumcision of Christ — circumcision (peritomē) is spiritual: 'made without hands' (cheiropoiētos) contrasts with Jewish literal circumcision. 'Putting off the body of the flesh' (apekdysis tou sōmatos tēs sarkos) is conversion's stripping: old self dies. 'In the circumcision of Christ' grounds circumcision in Christ's death and resurrection (not legal observance). Christian conversion is true circumcision.