'Of the Circumcision' in the Bible

But on the contrary, when they saw that the gospel of the uncircumcision was committed to me, as the gospel of the circumcision was to Peter;

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

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