'Of the Circumcision' in the Bible

but on the contrary, seeing that I am intrusted with the gospel of the uncircumcision, like Peter of the circumcision,

for the one having wrought with Peter unto the apostleship of the circumcision also wrought with me unto the Gentiles:

For before certain ones came from James, he was eating along with the Gentiles: but when they came, he withdrew and separated himself, fearing those who were of the circumcision.