'Of the Circumcision' in the Bible

And those of the circumcision who believed, as many as came with Peter, were astonished that on the gentiles also was poured out the gift of the Holy Spirit;

And when Peter went up to Jerusalem, they that were of the circumcision contended with him,

For before certain persons came from James, he used to eat with the gentiles; but when they came, he withdrew, and separated himself, fearing those who were of the circumcision.

and Jesus, who is called Justus; who are of the circumcision; these only are my fellowworkers for the kingdom of God, who have been an encouragement unto me.

For there are many unruly vain talkers and deceivers, especially they of the circumcision;