'Circumcised' in the Bible

(but neither was Titus, who was with me, being a Greek, compelled to be circumcised;)

Behold, I, Paul, say to you, that if ye are circumcised, Christ shall profit you nothing.

And I witness again to every man who is circumcised, that he is debtor to do the whole law.

As many as desire to have a fair appearance in the flesh, these compel you to be circumcised, only that they may not be persecuted because of the cross of Christ.

For neither do they that are circumcised themselves keep the law; but they wish you to be circumcised, that they may boast in your flesh.