'Of the Circumcision' in the Bible

What, then, is the superiority of the Jew? or what the profit of the circumcision?

And the father of circumcision to them who are not of the circumcision only, but who also walk in the steps of that faith of our father Abraham, which he had being yet uncircumcised.

Now I say that Jesus Christ was a minister of the circumcision for the truth of God, to confirm the promises made unto the fathers: