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1 Corinthians 5:6 (WEB)
Your boasting is not good. Don’t you know that a little yeast leavens the whole lump?

Catechism · 1

§129Article 3 · Sacred ScriptureRead at vatican.va
“Early Christian catechesis made constant use of the Old Testament.” — Catechism footnote: Cf. I Cor 5:6-8; 10:1-11.

Irenaeus of Lyons, Against Heresies IV.27Book IV
“And as then the condemnation of sinners extended to others who approved of them, and joined in their society; so also is it the case at present, that “a little leaven leaveneth the whole lump.”” — editor's note: 1 Cor. v. 6.
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BedeCatena Aurea on Luke
“For as a little leaven leaveneth a whole lump of meal, (1 Cor. 5:6.) so hypocrisy will rob the mind of all the purity and integrity of its virtues.” — the author cites it
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John Chrysostom, Homilies on Hebrews Homily 31
““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.)” — the author cites it
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JeromeCatena Aurea on Matthew
“This is the leaven of which the Apostle speaks, “A little leaven leaveneth the whole lump.” [1 Cor 5:6]” — the author cites it
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Tertullian, On Modesty Chapter 13
“…of the Lord, by the ejection of the incestuous fornicator; if, that is, he subjoins: “Know ye not, that a little leaven spoileth the savour of the whole lump?”” — editor's note: 1 Cor. v. 6, where Tertullian appears to have used δολοῖ, not ζυμοῖ.
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Tertullian, On Modesty Chapter 18
“…and so on, “with such to take no food even,” not to say the Eucharist: because, to wit, withal “a little leaven spoileth the flavour of the whole lump.”” — editor's note: Ver. 6.
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Tertullian, On the Apparel of Women II.2Book II
“Let whoever finds pleasure in “glorying in the flesh” see to that.” — editor's note: See Gal. vi. 13 and 1 Cor. iii. 21; v. 6.
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Gregory of Nyssa, The Great Catechism Chapter 39
“For, in the manner that, as the Apostle says, a little leaven assimilates to itself the whole lump, so in like manner that body to which immortality has been given it by God, when it is in ours, translates and transmutes the whole into itself.” — editor's note: 1 Cor. v. 6.
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