'Circumcision' in the Bible

But contrariwise, when they saw that the gospel of the uncircumcision was committed unto me, as the gospel of the circumcision was unto Peter;

(For he that wrought effectually in Peter to the apostleship of the circumcision, the same was mighty in me toward the Gentiles:)

And when James, Cephas, and John, who seemed to be pillars, perceived the grace that was given unto me, they gave to me and Barnabas the right hands of fellowship; that we should go unto the heathen, and they unto the circumcision.

For before that certain came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them which were of the circumcision.

For in Jesus Christ neither circumcision availeth any thing, nor uncircumcision; but faith which worketh by love.

And I, brethren, if I yet preach circumcision, why do I yet suffer persecution? then is the offence of the cross ceased.

For in Christ Jesus neither circumcision availeth any thing, nor uncircumcision, but a new creature.