Paul writes in I Corinthians 5:6-8, “Your glorying is not good. Do you not know that a little leaven leavens the whole lump? Therefore purge out the old leaven, that you may be a new lump, since you truly are unleavened. For indeed Christ, our Passover, was sacrificed for us. Therefore let us keep the feast, not with old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth.”
God calls on His children to get rid of the sin that corrupts His good work in us. That would be leaven, according to the Scripture here. Because we are God’s workmanship, we are His unleavened bread – touched by His loving hands, sifted by His unlimited mercy, and purged by His Son’s blood.
He commands us to celebrate our unleavened-ness with sincerity and truth. Sincerity, because our fellowship must be real and genuine, pure and clear. Truth, because that is how we must worship Him. Unleavened in this way, our gatherings, our feasts, are free from worldly ways. Ours should be a pure and simple fellowship with Jesus and with each other. Anything else is a recipe for disaster.
But there’s more in the Scripture. For just before these verses, and immediately after them, Paul addressed the matter of faithful followers tolerating sin in their midst. That is relevant today – in 2012 – because we don’t have the Biblical authority to do that. But we do have the Biblical authority to put away from yourselves the evil person (I Corinthians 5:13).
There is no glory in tolerating sin or the person who has leavened himself with the sins of the world.