Circumcision in the O.T. was a commandment that was carried out in a physical fashion. Males had to undergo a literal, physical circumcision of their foreskin. However, in the New Testament the physical aspect of circumcision is abandoned, in favor of a newly acquired spiritual meaning:
Colossians 2:8-14 (ESV):
8 See to it that no one takes you captive by philosophy and empty deceit, according to human tradition, according to the elemental spirits of the world, and not according to Christ. 9 For in him the whole fullness of deity dwells bodily, 10 and you have been filled in him, who is the head of all rule and authority. 11 In him also you were circumcised with a circumcision made without hands, by putting off the body of the flesh, by the circumcision of Christ, 12 having been buried with him in baptism, in which you were also raised with him through faith in the powerful working of God, who raised him from the dead. 13 And you, who were dead in your trespasses and the uncircumcision of your flesh, God made alive together with him, having forgiven us all our trespasses, 14 by canceling the record of debt that stood against us with its legal demands. This he set aside, nailing it to the cross.
Yes, Christians are still expected to be circumcised in the New Testament, but not physically, but spiritually. Circumcision is a clear example in which an O.T. commandment mutates from an old literal physical observance to a new spiritual observance. The physical aspect is dropped, in favor of the new spiritual counterpart.
Question: are there other O.T. commandments that experienced a similar adaptation from 'physical' to 'spiritual' upon entering the New Covenant? Or is circumcision one of a kind in this regard?