Galatians 5:1-4 (NASB) It was for freedom that Christ set us free; therefore keep standing firm and do not be subject again to a yoke of slavery. 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.
 

Note: "Law" (v. 4) refers to the Old Law or the Law of Moses (i.e., Old Testament Law).