I Corinthians 5:11

But now I have written - I not only write this, but I add more: if any one who is called a brother, i.e. professes the Christian religion, be a fornicator, covetous, idolater, railer, drunkard, or extortioner, not even to eat with such - have no communion with such a one, in things either sacred or civil. You may transact your worldly concerns with a person that knows not God, and makes no profession of Christianity, whatever his moral character may be; but ye must not even thus far acknowledge a man professing Christianity, who is scandalous in his conduct. Let him have this extra mark of your abhorrence of all sin; and let the world see that the Church of God does not tolerate iniquity.

But now--"Now" does not express time, but "the case being so," namely, that to avoid fornicators, &c., of the world, you would have to leave the world altogether, which would be absurd. So "now" is used in Heb 11:16. Thus we avoid making the apostle now retract a command which he had before given. I have written--that is, my meaning in the letter I wrote was "not to keep company," &c. a brother--contrasted with a "fornicator . . . of the world" (Co1 5:10). There is less danger in associating with open worldlings than with carnal professors. Here, as in Eph 5:3, Eph 5:5, "covetousness" is joined with "fornication": the common fount of both being "the fierce and ever fiercer longing of the creature, which has turned from God, to fill itself with the inferior objects of sense" [TRENCH, Greek Synonyms of the New Testament]. Hence "idolatry" is associated with them: and the covetous man is termed an "idolater" (Num 25:1-2). The Corinthians did not fall into open idolatry, but ate things offered to idols, so making a compromise with the heathen; just as they connived at fornication. Thus this verse prepares for the precepts in Co1 8:4, &c. Compare the similar case of fornication, combined with a similar idolatrous compromise, after the pattern of Israel with the Midianites (Rev 2:14). no not to eat--not to sit at the same table with such; whether at the love-feasts (agapÃ&brvbr) or in private intercourse, much more at the Lord's table: at the last, too often now the guests "are not as children in one family, but like a heterogeneous crowd of strangers in an inn" [BENGEL] (compare Gal 2:12; Jo2 1:10-11).

But now have I written unto you,.... Which shows, that what he had written before was at another time, and in another epistle; but not that what he was now writing was different from the former, only he explains the persons of whom, and the thing about which he has before written: not to keep company, if any man that is called a brother, be a fornicator; or if any man that is a brother is called, or named a fornicator; or covetous, or an idolater; or a railer, or a drunkard, or an extortioner, with such an one, no, not to eat. The apostle's meaning is, that in his prohibition of keeping company with men of the above character, he would be understood of such persons as were called brethren; who had been received into the church, and had been looked upon, and had professed themselves to be such; and who might be mentioned by name, as notoriously guilty of fornication, covetousness, idolatry, and extortion, mentioned in the former verse; to which are added two other sins any of them might be addicted to, as "railing" either at their fellow brethren and Christians, or others giving reproachful language to them, and fixing invidious characters on them: and "drunkenness"; living in the frequent commission of that sin, and others before spoken of; and that such persons remaining impenitent and incorrigible, still persisting, in such a vicious course of life, after due admonition given them, were not only to be removed from their religious society, from the communion of the church, and be debarred sitting down, and eating with them at the Lord's table, or at their love feasts, but also were to be denied civil conversation and familiarity with them, and even not suffered to eat common food at the same table with them: which though lawful to be used with the men of the world, yet…

In this chapter the apostle, I. Blames them for their indulgence in the case of the incestuous person, and orders him to be excommunicated, and delivered to Satan (Co1 5:1-6). II. He exhorts them to Christian purity, by purging out the old leaven (Co1 5:7, Co1 5:8). And, III. Directs them to shun even the common conversation of Christians who were guilty of any notorious and flagitious wickedness (Co1 5:9 to the end).

5:11 Separation from a professing believer who was living in sin was intended to reinforce and maintain the high moral standards of the Christian community. The social pressure it exerted might also encourage repentance in an erring brother or sister (cp. 2 Thes 3:6, 14).