(17-20) Here the Epistle would naturally end, but an afterthought occurs to the Apostle, His experience of other churches, especially those at Corinth and in Galatia, suggests to him that he should warn his readers against false teachers, though such had not as yet obtained any great hold among them.

(17) Cause divisions and offences.--Set traps in the way of the unwary, so as to entice them into false doctrine and schismatical practices.

Verse 17. - Now I beseech you, brethren, mark them which cause the divisions and offences (τὰ σκάνδαλα, meaning "causes of stumbling." Both the words have the article, so as to denote things known of) contrary to the doctrine which ye learned; and avoid them; rather, turn away from them; i.e. shun them; have nothing to do with them. The allusion seems to be, not to persons within the Church, but rather to outsiders, who come with new notions to disturb its peace.

16:17-20 How earnest, how endearing are these exhortations! Whatever differs from the sound doctrine of the Scriptures, opens a door to divisions and offences. If truth be forsaken, unity and peace will not last long. Many call Christ, Master and Lord, who are far from serving him. But they serve their carnal, sensual, worldly interests. They corrupt the head by deceiving the heart; perverting the judgments by winding themselves into the affections. We have great need to keep our hearts with all diligence. It has been the common policy of seducers to set upon those who are softened by convictions. A pliable temper is good when under good guidance, otherwise it may be easily led astray. Be so wise as not to be deceived, yet so simple as not to be deceivers. The blessing the apostle expects from God, is victory over Satan. This includes all designs and devices of Satan against souls, to defile, disturb, and destroy them; all his attempts to keep us from the peace of heaven here, and the possession of heaven hereafter. When Satan seems to prevail, and we are ready to give up all as lost, then will the God of peace interpose in our behalf. Hold out therefore, faith and patience, yet a little while. If the grace of Christ be with us, who can prevail against us?Now I beseech you, brethren,.... The apostle being about to finish his epistle, and recollecting that he had not given this church any instructions about the false teachers, who had been the cause of all their differences and uneasiness, inserts them here; or he purposely put them in this place, amidst his salutations, that they might be taken the more notice of; and very pertinently, since nothing could more express his great affection and tender concern for them; and these instructions he delivers to them, not in an authoritative way, as he might, and sometimes did, but by way of entreaty, beseeching them, and with the kind and loving appellation of brethren, the more to engage them to attend to what he was about to say to them:

them which cause divisions and offences, contrary to the doctrine which ye have learned. The men he would have taken notice of were such who divided them in their religious sentiments, introducing heterodox notions, contrary to the doctrine of the Scriptures, of Christ and his apostles, and which they had learned from them; such as justification by the works of the law, the observance of Jewish days, and abstinence from meats, enjoined by the ceremonial law, and that as necessary to salvation; to which some gave heed, and others not, and so were divided; whereas the doctrine of faith is but one, the Gospel is one uniform thing, all of a piece; and those that profess it ought to be perfectly joined together in the same mind, and in the same judgment: hence their minds were alienated from each other, and they began to despise and judge one another, yea, to go into factions and parties, being unwilling to receive and admit each other to communion; and thus by these men they were divided in sentiments, affection, and worship; and which must needs cause offence to the church and the godly members of it, as well as cause many so to be offended, as to stumble and fall from the doctrine of faith, and profession of it, and greatly stagger and distress weak believers, and bring a scandal on religion, and the name and ways of Christ among the world, as nothing does more so than the jars and discords among Christians: wherefore the apostle advises to "mark" such persons, look out for, narrowly watch, strictly observe, and diligently examine them: the metaphor is taken from watchmen, who look out from their watch tower, and observe who are coming, or pass by, and take up suspicious persons, and carefully inquire who they are, and what they are about, and whether friends or foes. So both ministers of the Gospel, and members of churches, should not be asleep, which is the opportunity false teachers take to sow the seeds of false doctrine, discord, and contention, but should watch, and be upon their guard, and look diligently, that none among them fail of, or fall from, the doctrine of grace, or any root of bitterness, error, or heresy as well as immorality, spring up, which may be troublesome, and defile others; they should observe, and take notice of such who are busy to spread false doctrine, should watch their motions, follow them closely, take them to an account, examine their principles according to the word of God; and if found to be contrary thereunto, note them as false teachers:

and avoid them; shun their ministry, drop attendance on it, depart far from them, have no private conversation with them, receive them not into their houses, nor bid them God speed; with such do not eat, have no communion with them at the Lord's table, withdraw from them as disorderly persons, who act contrary to the doctrine and order of the Gospel, and after proper admonition reject them from all fellowship with you.