Your glorying - Your boasting; or confidence in your present condition, as if you were eminent in purity and piety.

Is not good - Is not well, proper, right. Boasting is never good; but it is especially wrong when, as here, there is an existing evil that is likely to corrupt the whole church. When people are disposed to boast, they should at once make the inquiry whether there is not some sin indulged in, on account of which they should be humbled and subdued. If all individual Christians, and all Christian churches, and all people of every rank and condition, would look at things as they are, they would never find occasion for boasting. It is only when we are blind to the realities of the ease, and overlook our faults, that we are disposed to boast. The reason why this was improper in Corinth, Paul states - that any sin would tend to corrupt the whole church, and that therefore they ought not to boast until that was removed.

A little leaven ... - A small quantity of leaven or yeast will pervade the entire mass of flour, or dough, and diffuse itself through it all. This is evidently a proverbial saying. It occurs also in Galatians 5:9. Compare the note at Matthew 13:33. A similar figure occurs also in the Greek classic writers - By leaven the Hebrews metaphorically understood whatever had the power of corrupting, whether doctrine, or example, or anything else. See the note at Matthew 16:6. The sense here is plain. A single sin indulged in, or allowed in the church, would act like leaven - it would pervade and corrupt the whole church, unless it was removed. On this ground, and for this reason, discipline should be administered, and the corrupt member should be removed.

Your glorying is not good - You are triumphing in your superior knowledge, and busily employed in setting up and supporting your respective teachers, while the Church is left under the most scandalous corruptions - corruptions which threaten its very existence if not purged away.

Know ye not - With all your boasted wisdom, do you not know and acknowledge the truth of a common maxim, a little leaven leaveneth the whole lump? If this leaven - the incestuous person, be permitted to remain among you; if his conduct be not exposed by the most formidable censure; the flood-gates of impurity will be opened on the Church, and the whole state of Christianity ruined in Corinth.

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.

Glorying (καῦχημα)

Not the act, but the subject of boasting; namely, the condition of the Corinthian church.

Lump (φύραμα)

See on Romans 12:21. A significant term, suggesting the oneness of the Church, and the consequent danger from evil-doers.

{7} Your glorying {d} is not good. Know ye not that a little leaven leaveneth the whole lump?

(7) Another goal of excommunication is that others are not infected, and therefore it must of necessity be retained in the Church, so that one is not infected by the other.

(d) Is nothing and not grounded upon good reason, as though you were excellent, and yet there is such wickedness found among you.

5:6 Your glorying is not good. Boasting, in such a state of affairs, was unseemly.

A little leaven leaveneth the whole lump. As a little leavens the whole mass of dough, so one sinner suffered to go on in impurity sends a corrupting influence through the whole church. Compare Ga 5:9.

5:6 Your glorying - Either in your gifts or prosperity, at such a time as this, is not good. Know ye not that a little leaven - One sin, or one sinner. Leaveneth the whole lump - Diffuses guilt and infection through the whole congregation.

6. Your glorying in your own attainments and those of your favorite teachers (1Co 3:21; 4:19; 5:2), while all the while ye connive at such a scandal, is quite unseemly.

a little leaven leaveth . whole lump-(Ga 5:9), namely, with present complicity in the guilt, and the danger of future contagion (1Co 15:33; 2Ti 2:17).

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.