Gal 5:2-12 (NASB)
2 Behold I, Paul, say to you that if you receive circumcision, Christ will be of no benefit to you. 3 And I testify again to every man who receives circumcision, that he is under obligation to keep the whole Law. 4 You have been severed from Christ, you who are seeking to be justified by law; you have fallen from grace. 5 For we through the Spirit, by faith, are waiting for the hope of righteousness. 6 For in Christ Jesus neither circumcision nor uncircumcision means anything, but faith working through love.
7 You were running well; who hindered you from obeying the truth? 8 This persuasion did not come from Him who calls you. 9 A little leaven leavens the whole lump of dough. 10 I have confidence in you in the Lord that you will adopt no other view; but the one who is disturbing you will bear his judgment, whoever he is. 11 But I, brethren, if I still preach circumcision, why am I still persecuted? Then the stumbling block of the cross has been abolished. 12 I wish that those who are troubling you would even mutilate themselves.