Here the apostle exhorts them to purity, by purging out the old leaven. In this observe,

I.The advice itself, addressed either, 1. To the church in general; and so purging out the old leaven, that they might be a new lump, refers to the putting away from themselves that wicked person, Co1 5:13. Note, Christian churches should be pure and holy, and not bear such corrupt and scandalous members. They are to be unleavened, and should endure no such heterogeneous mixture to sour and corrupt them. Or, 2. To each particular member of the church. And so it implies that they should purge themselves from all impurity of heart and life, especially from this kind of wickedness, to which the Corinthians were addicted to a proverb. See the argument at the beginning. This old leaven was in a particular manner to be purged out, that they might become a new lump. Note, Christians should be careful to keep themselves clean, as well as purge polluted members out of their society. And they should especially avoid the sins to which they themselves were once most addicted, and the reigning vices of the places and the people where they live. They were also to purge themselves from malice and wickedness - all ill-will and mischievous subtlety. This is leaven that sours the mind to a great degree. It is not improbable that this was intended as a check to some who gloried in the scandalous behaviour of the offender, both out of pride and pique. Note, Christians should be careful to keep free from malice and mischief. Love is the very essence and life of the Christian religion. It is the fairest image of God, for God is love (Jo1 4:16), and therefore it is no wonder if it be the greatest beauty and ornament of a Christian. But malice is murder in its principles: He that hates his brother is a murderer (Jo1 3:15), he bears the image and proclaims him the offspring of him who was a murderer from the beginning, Joh 8:44. How hateful should every thing be to a Christian that looks like malice and mischief.

II.The reason with which this advice is enforced: For Christ our passover is sacrificed for us, Co1 5:7. This is the great doctrine of the gospel. The Jews, after they had killed the passover, kept the feast of unleavened bread. So must we; not for seven days only, but all our days. We should die with our Saviour to sin, be planted into the likeness of his death by mortifying sin, and into the likeness of his resurrection by rising again to newness of life, and that internal and external. We must have new hearts and new lives. Note, The whole life of a Christian must be a feast of unleavened bread. His common conversation and his religious performances must be holy. He must purge out the old leaven, and keep the feast of unleavened bread of sincerity and truth. He must be without guilt in his conduct towards God and man. And the more there is of sincerity in our own profession, the less shall we censure that of others. Note, On the whole, The sacrifice of our Redeemer is the strongest argument with a gracious heart for purity and sincerity. How sincere a regard did he show to our welfare, in dying for us! and how terrible a proof was his death of the detestable nature of sin, and God's displeasure against it! Heinous evil, that could not be expiated but with the blood of the Son of God! And shall a Christian love the murderer of his Lord? God forbid.

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 Co1 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.

Therefore let us keep the feast,.... Not the feast of the passover, which was now ceased, though this is said in allusion to it; when the master of the house used to say (l),

"everyone that is hungry, let him come and eat; he that hath need, let him come "and paschatize", or keep the feast of the passover:''

but rather the feast of the Lord's supper is here meant, that feast of fat things Isaiah prophesied of; in which are the richest entertainments, even the flesh and blood of Christ; though it seems best to understand it of the whole course of a Christian's life, spent in the exercise of spiritual joy and faith in Christ; he that is of a merry heart, as the believer of all men in the world has reason to be of, "hath a continual feast", Pro 15:15 of spiritual mirth and pleasure, rejoicing always in Christ, as he ought to do: which feast, or course of life, is to be kept "not with old leaven"; in the old, vain, sinful manner of conversation, as before:

neither with the leaven of malice and wickedness; not in malice to any man, or one another, nor in any sort of wickedness, living in no known sin, and allowing of it:

but with the unleavened bread of sincerity; as opposed to malice, of sincere love to God and Christ, and to his people: and of truth; of Gospel doctrine, discipline, and conversation.

(l) Haggada Shel Pesach, p. 4. Ed. Rittangel.

not . . . old leaven--of our unconverted state as Jews or heathen.

malice--the opposite of "sincerity," which allows no leaven of evil to be mixed up with good (Mat 16:6).

wickedness--the opposite of "truth," which allows not evil to be mistaken for good. The Greek for "malice" means the evil habit of mind; "wickedness," the outcoming of the same in word and deed. The Greek for "sincerity" expresses literally, a thing which, when examined by the sun's light, is found pure and unadulterated.