(6) Your glorying is not good.--There is possibly a reference here to some boasting regarding their spiritual state contained in the letter which had reached St. Paul from Corinth, and to which part of this Epistle is a reply. (See 1Corinthians 7:1.) So long as there is that one bad person amongst you it gives a bad character to the whole community, as leaven, though it may not have pervaded the entire lump, still makes it not the unleavened bread which was necessary for the Paschal Feast. This Epistle being written shortly before Pentecost (1Corinthians 16:8), it was very likely some time about or soon after Easter, hence the leaven and the Paschal Feast naturally suggest themselves as illustrations. The Apostle passes on rapidly from the mention of the leaven to the whole scene of the feast. As with the most minute and scrupulous care the Jew would remove every atom of leaven when the Paschal lamb was to be eaten, so our Paschal Lamb having been slain, we must take care that no moral leaven remains in the sacred household of the Church while she keeps her perpetual feast of prayer and thanksgiving.

Verse 6. - Your glorying; rather, the subject of your boasting, the point on which you glorify yourselves. The Greek word does not mean the act of boasting, but the thing of which we boast. Not good. The Greek word is not agathon, but kalon, an almost untranslatable word, which implies all moral beauty, and resembles the English word "fair" or "noble." When he says that it is "not good," he uses the figure called litotes; i.e. he employs an expression intentionally too weak, that it may be corrected into a stronger one by the involuntary indignation of the reader; as when Virgil calls the cannibal tyrant Busiris "unpraised." Hence the clause is equivalent to "the thing of which you are boasting is detestable." Know ye not. This clause is used by St. Paul in specially solemn appeals, and almost exclusively in these Epistles (1 Corinthians 3:16; 1 Corinthians 6:16, 19; 1 Corinthians 9:13, 24). A little leaven leaveneth the whole lump (Galatians 5:9). The taint alluded to is not only the presence of the unpunished offender, but the general laxity and impurity displayed by their whole bearing in the matter (comp. the line of Menander quoted in ch. 15:33, and the "root of bitterness" in Hebrews 12:15). (For the word "lump," see Romans 11:16.)

5:1-8 The apostle notices a flagrant abuse, winked at by the Corinthians. Party spirit, and a false notion of Christian liberty, seem to have saved the offender from censure. Grievous indeed is it that crimes should sometimes be committed by professors of the gospel, of which even heathens would be ashamed. Spiritual pride and false doctrines tend to bring in, and to spread such scandals. How dreadful the effects of sin! The devil reigns where Christ does not. And a man is in his kingdom, and under his power, when not in Christ. The bad example of a man of influence is very mischievous; it spreads far and wide. Corrupt principles and examples, if not corrected, would hurt the whole church. Believers must have new hearts, and lead new lives. Their common conversation and religious deeds must be holy. So far is the sacrifice of Christ our Passover for us, from rendering personal and public holiness unnecessary, that it furnishes powerful reasons and motives for it. Without holiness we can neither live by faith in him, nor join in his ordinances with comfort and profit.Your glorying is not good,.... Their glorying in their outward flourishing condition, in their riches and wealth, and in their ministers, in their wisdom and parts when under such an humbling dispensation; and especially if their glorying was in the sin itself, and their connivance at it, it was far from being good, it was very criminal, as the consequence of it was dangerous:

know ye not that a little leaven leaveneth the whole lump? This, in nature, is what everybody knows; and the proverb, which is much used by the Jews (f), was common in the mouths of all, and the meaning of it easy to be understood: thus, whether applied to the leaven of false doctrine, nothing is more manifest, than when this is let alone, and a stop is not put to it, it increases to more ungodliness; or to vice and immorality, as here; which if not taken notice of by a church, is not faithfully reproved and severely censured, as the case requires, will endanger the whole community; it may spread by example, and, under the connivance of the church, to the corrupting of good manners, and infecting of many.

(f) Neve Shalom apud Caphtor, fol. 41. 1.