What does the Bible say about spiritual circumcision?

Spiritual circumcision is a metaphor used in the New Testament to describe the work of the Holy Spirit in the life of a believer. It signifies an inward transformation of the heart, as stated in Colossians 2:11, where it speaks of a circumcision made without hands. This operation of God takes place during regeneration, wherein a person is born again and made a new creature in Christ. This transformation is essential for salvation and reflects the believer's complete reliance on Christ for righteousness, rather than on any external practices or laws, such as the Jewish practice of physical circumcision.