1 Corinthians 5:7-9

Verse 7

Purge out therefore the old leaven - As it is the custom of the Jews previously to the passover to search their houses in the most diligent manner for the old leaven, and throw it out, sweeping every part clean; so act with this incestuous person. I have already shown with what care the Jews purged their houses from all leaven previously to the passover; see the note on Exo 12:8-19 (note), and on the term passover, and Christ as represented by this ancient Jewish sacrifice; see on Exo 12:27 (note), and my Discourse on the Nature and Design of the Eucharist.
Verse 8

Therefore let us keep the feast - It is very likely that the time of the passover was now approaching, when the Church of Christ would be called to extraordinary acts of devotion, in commemorating the passion, death, and resurrection of Christ; and of this circumstance the apostle takes advantage in his exhortation to the Corinthians. See the Introduction, Section 12.

Not with old leaven - Under the Christian dispensation we must be saved equally from Judaism, heathenism, and from sin of every kind; malice and wickedness must be destroyed; and sincerity and truth, inward purity and outward holiness, take their place.

The apostle refers here not more to wicked principles than to wicked men; let us keep the feast, not with the old leaven - the impure principles which actuated you while in your heathen state; neither with the leaven of malice and wickedness, κακιας και πονηριας, wickedness, radical depravity, producing unrighteousness in the life; nor with the persons who are thus influenced, and thus act; but with the unleavened bread, αλλ' εν αζυμοις, but with upright and godly men, who have sincerity, ειλικρινεια, such purity of affections and conduct, that even the light of God shining upon them discovers no flaw, and truth - who have received the testimony of God, and who are inwardly as well as outwardly what they profess to be.

The word πονηριας, which we translate wickedness, is so very like to πορνειας, fornication, that some very ancient MSS. have the latter reading instead of the former; which, indeed, seems most natural in this place; as κακιας, which we translate malice, includes every thing that is implied in πονηριας, wickedness whereas πορνειας, as being the subject in question, see 1Cor 5:1, would come more pointedly in here: Not with wickedness and fornication, or rather, not with wicked men and fornicators: but I do not contend for this reading.
Verse 9

I wrote unto you in an epistle - The wisest and best skilled in Biblical criticism agree that the apostle does not refer to any other epistle than this; and that he speaks here of some general directions which he had given in the foregoing part of it; but which he had now in some measure changed and greatly strengthened, as we see from 1Cor 5:11. The words εγραψα εν τῃ επιστολῃ may be translated, I Had written to you in This Epistle; for there are many instances in the New Testament where the aorist, which is here used, and which is a sort of indefinite tense, is used for the perfect and the plusquam-perfect. Dr. Whitby produces several proofs of this, and contends that the conclusion drawn by some, viz. that it refers to some epistle that is lost, is not legitimately drawn from any premises which either this text or antiquity affords. The principal evidence against this is 2Cor 7:8, where εν τῃ επιστολῃ, the same words as above, appear to refer to this first epistle. Possibly the apostle may refer to an epistle which he had written though not sent; for, on receiving farther information from Stephanas, Fortunatus, and Achaicus, relative to the state of the Corinthian Church, he suppressed that, and wrote this, in which he considers the subject much more at large. See Dr. Lightfoot.

Not to company with fornicators - With which, as we have already seen, Corinth abounded. It was not only the grand sin, but staple, of the place.
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