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1 Corinthians 5:6

Your glorying is not good. Know you not that a little leaven corrupteth the whole lump?

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The verse in its languages

Vulgate (Clementine)
Non est bona gloriatio vestra. Nescitis quia modicum fermentum totam massam corrumpit ?
Greek New Testament (SBLGNT)
Οὐ καλὸν τὸ καύχημα ὑμῶν. οὐκ οἴδατε ὅτι μικρὰ ζύμη ὅλον τὸ φύραμα ζυμοῖ;

Haydock's commentary

On verses 6 to 8

Your glorying is not good, when you suffer such a scandal among you: you have little reason to boast of your masters, or even of the gifts and graces you received. A little leaven corrupteth the whole mass; a public scandal, when not punished, is of dangerous consequence.

Purge out the old leaven. He alludes to the precept given to the Jews of having no leaven in their houses during the seven days of the Paschal feast. For our Pasch, i.e. Paschal lamb, Christ is sacrificed: and Christians, says St. Chrysostom, must keep this feast continually, by always abstaining from the leaven of sin. (Witham)

Where a note speaks of the Jewish people, the Church teaches that the Passion cannot be charged against all the Jews then living, nor against the Jews of today, and that all sinners were its authors (CCC 597, 598).

From Haydock's Catholic Bible Commentary, 1859, in the transcription made by Todd Easton and kept online by John Paul Wohlschied at johnblood.gitlab.io/haydock.

The Fathers on this verse

St Irenaeus Against Heresies: Book IV, Chapter XXVII, The sins of the men of

4. Since therefore, beyond all doubt and contradiction, the apostle shows that there is one and the same God, who did both enter into judgment with these former things, and who does inquire into those of the present time, and points out why these things have been committed to writing; all these men are found to be unlearned and presumptuous, nay, even destitute of common sense, who, because of the transgressions of them of old time, and because of the disobedience of a vast number of them, do allege that there was indeed one God of these men, and that He was the maker of the world, and existed in a state of degeneracy; but that there was another Father declared by Christ, and that this Being is He who has been conceived by the mind of each of them; not understanding that as, in the former case, God showed Himself not well pleased in many instances towards those who sinned, so also in the …

Tertullian On the Apparel of Women, Chapter III

Let it now be granted that excellence of form be not to be feared, as neither troublesome to its possessors, nor destructive to its desirers, nor perilous to its compartners; let it be thought (to be) not exposed to temptations, not surrounded by stumbling-blocks: it is enough that to angels of God it is not necessary. For, where modesty is, there beauty is idle; because properly the use and fruit of beauty is voluptuousness, unless any one thinks that there is some other harvest for bodily grace to reap. …

Tertullian On Modesty, Chapter XVIII

For even in the Proverbs, which we call Parœmiæ, Solomon specially (treats) of the adulterer (as being) nowhere admissible to expiation. “But the adulterer,” he says, “through indigence of senses acquireth perdition to his own soul; sustaineth dolors and disgraces. His ignominy, moreover, shall not be wiped away for the age. For indignation, full of jealousy, will not spare the man in the day of judgment.” If you think this said about a heathen, at all events about believers you have already heard (it said) through Isaiah: “Go out from the midst of them, and be separate, and touch not the impure.” You have at the very outset of the Psalms, “Blessed the man who hath not gone astray in the counsel of the impious, nor stood in the way of sinners, and sat in the state-chair of pestilence;” whose voice, withal, (is heard) subsequently: “I have not sat with the conclave of vanity; and with the …

St Augustine Letter CCXI

3. When I reflect on these good things, these gifts of God in you, my heart, amid the many storms by which it is agitated through evils elsewhere, is wont to find perfect rest. “Ye did run well; who did hinder you, that ye should not obey the truth? This persuasion cometh not of Him that calleth you.” “A little leaven ”, I am unwilling to complete the sentence, for I rather desire, entreat, and exhort that the leaven itself be transformed into something better, lest it change the whole lump for the worse, as it has already almost done. If, therefore, you have begun to put forth again the buddings of a sound discernment as to your duty, pray that you enter not into temptation, nor fall again into strifes, emulations, animosities, divisions, evil speaking, seditions, whisperings. …

St Augustine On the Morals of the Catholic Church, Of Justice and Prudence

45. With equal brevity we must treat of prudence, to which it belongs to discern between what is to be desired and what to be shunned. Without this, nothing can be done of what we have already spoken of. It is the part of prudence to keep watch with most anxious vigilance, lest any evil influence should stealthily creep in upon us. Thus the Lord often exclaims, "Watch;" and He says, "Walk while ye have the light, lest darkness come upon you." And then it is said, "Know ye not that a little leaven leaveneth the whole lump?" And no passage can be quoted from the Old Testament more expressly condemning this mental somnolence, which makes us insensible to destruction advancing on us step by step, than those words of the prophet, "He who despiseth small things shall fall by degrees." On this topic I might discourse at length did our haste allow of it. …

St John Chrysostom Homilies on First Corinthians, Homily XV

Ver. 6 . “Your glorying is not good:” signifying that it was they up to the present time who had hindered him from repenting, by taking pride in him. Next he shews that he is taking this step in order to spare not that person only, but also those to whom he writes. To which effect he adds, “Know ye not, that a little leaven leaveneth the whole lump?” “For,” saith he, “though the offence be his, yet if neglected it hath power to waste the rest of the body of the Church also. For when the first transgressor escapes punishment, speedily will others also commit the same faults.” In these words he indicates moreover that their struggle and their danger is for the whole Church, not for any one person. For which purpose he needeth also the similitude of the leaven. …

St John Chrysostom Homilies on Second Corinthians, Homily IV

[5.] Ver. 9. “For to this end also did I write to you, that I might know the proof of you, whether ye are obedient in all things;” not only in cutting off but also in reuniting. Seest thou how here again he brings the danger to their doors. For as when he sinned, he alarmed their minds, except they should cut him off, saying, “A little leaven leaveneth the whole lump,” ( 1 Cor. v. 6 .) and several other things; so here too again he confronts them with the fear of disobedience, as good as saying, ‘As then ye had to consult not for him, but for yourselves too, so now must ye not less for yourselves than for him; lest ye seem to be of such as love contention and have not human sensibilities, and not to be in all things obedient. And hence he saith, “For to this end also did I write to you, that I might know the proof of you, whether ye are obedient in all things.”

St John Chrysostom Homilies on Second Corinthians, Homily IV

Seest thou how he both committeth the power to them and again taketh away that by that he may soften them, by this eradicate their self will. But this is not all that he provides for by this, but shows also that should they be disobedient the harm would reach to all, just as he did at the outset also. For then too he said, “A little leaven leaveneth the whole lump.” ( 1 Cor. v. 6 .) And here again, “Lest Satan should get an advantage of us.” And throughout, he maketh this forgiveness the joint act of himself and them. Consider it from the first. “But if any,” saith he, “have caused sorrow he hath caused sorrow not to me, but in part (that I press not too heavily) to you all.” Then again, “Sufficient to such a one is this punishment which was” inflicted by the “many.” This is his own decision and opinion. …

St John Chrysostom Homilies on Second Corinthians, Homily XV

[3.] Ver. 12 . “So although I wrote unto you,” I wrote “not for his cause that did the wrong, nor for his cause that suffered the wrong.” For that they might not say, Why then dost thou rebuke us if we were “clear in the matter?” setting himself to meet this even further above, and disposing of it beforehand, he said what he said, namely, “I do not regret, though I did regret.” ‘For so far,’ says he, ‘am I from repenting now of what I wrote then, that I repented then more than I do now when ye have approved yourselves.’ Seest thou again his vehemence and earnest contention, how he has turned around what was said unto the very opposite. For what they thought would have made him recant in confusion as having rebuked them hastily, by reason of their amendment; that he uses as a proof that it was right in him to speak freely. …

St John Chrysostom The Homilies of St. John Chrysostom on the Epistle to the Hebrews, Hebrews 12.14

“Looking diligently,” he saith, that is, searching carefully, considering, thoroughly ascertaining, as is done in the case of sick persons, and in all ways examining, thoroughly ascertaining. “Lest any root of bitterness springing up trouble you.” ( Deut. xxix. 18 .) This is found in Deuteronomy; and he derived it from the metaphor of plants. “Lest any root of bitterness,” he says; which he said also in another place when he writes, “A little leaven leaveneth the whole lump.” ( 1 Cor. v. 6 .) Not for his sake alone do I wish this, he means, but also on account of the harm arising therefrom. That is to say, even if there be a root of this kind, do not suffer any shoot to come up, but let it be cut off, that it may not bear its proper fruits, that so it may not defile and pollute the others also. …

St Gregory of Nyssa The Great Catechism, Chapter XXXVII

But since the human being is a twofold creature, compounded of soul and body, it is necessary that the saved should lay hold of the Author of the new life through both their component parts. Accordingly, the soul being fused into Him through faith derives from that the means and occasion of salvation; for the act of union with the life implies a fellowship with the life. But the body comes into fellowship and blending with the Author of our salvation in another way. …

The Catechism cites this verse