Galatians 5:2

“Behold, I Paul say unto you, etc..] The apostle proceeds to give some reasons and arguments to enforce the above exhortation and dissuasion: the first of which is introduced with a note of attention, “behold”; what he was about to say being matter of great moment and importance; and also mentions himself by name, as the assertor of it; and that, either because his name was well known to them, and the rather because of his apostolical authority; and to show his full assurance of this matter, and his intrepidity, and that he was no ways ashamed of it, they might, if they pleased, say it to whomsoever they would, that Paul the apostle affirmed, that if ye be circumcised Christ shall profit you…”

“Behold--that is, Mark what I say. I Paul--Though you now think less of my authority, I nevertheless give my name and personal authority as enough by itself to refute all opposition of adversaries. if ye be circumcised--not as ALFORD, "If you will go on being circumcised." Rather, "If ye suffer yourselves to be circumcised," namely, under the notion of its being necessary to justification (Gal 5:4; Act 15:1). Circumcision here is not regarded simply by itself (for, viewed as a mere national rite, it was practiced for conciliation's sake by Paul himself, Act 16:3), but as the symbol of Judaism and legalism in general. If this be necessary, then the Gospel of grace is at an end. If the latter…”

“Behold, I Paul say unto you - I, who at first preached the gospel to you; I, too, who have been circumcised, and who was formerly a strenuous assertor of the necessity of observing the laws of Moses; and I, too, who am charged (see Galatians 5:11) with still preaching the necessity of circumcision, now solemnly say to you, that if you are circumcised with a view to being justified by that in whole or in part, it amounts to a rejection of the doctrine of justification by Christ, and an entire apostacy from him. He is to be “a whole Saviour.” No one is to share with him in the honor of saving people; and no rite, no custom, no observance of law, is to divide the honor with his death. The…”

“If ye be circumcised - And seek to be justified thereby. Christ - The Christian institution. Will profit you nothing - For you hereby disclaim Christ, and all the blessings which are through faith in him. Galatians 5:3”

“5:2-6 The Judaizers taught that keeping the law would earn God’s favor (cp. Acts 15:1), but that path actually leads to alienation from God. Real righteousness comes to those who live in Christ by the power of the Spirit. 5:2 Paul reminded the Galatians of who was talking to them: the apostle of Christ who represented the Lord to the Gentiles and who had first proclaimed the Good News to them.”

“I Paul: Co1 16:21; Co2 10:1; Th1 2:18; Plm 1:9 that: Gal 5:4, Gal 5:6, Gal 2:3-5; Act 15:1, Act 15:24, Act 16:3, Act 16:4; Rom 9:31, Rom 9:32, Rom 10:2, Rom 10:3; Heb 4:2 Galatians 5:3”