Yeast Infections in the Church

6 Your glorying is not good. Know ye not that a little leaven leaveneth the whole lump?
7 Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us:
1 Cor 5

Iniquity is spreading like a a yeast infection, so God is purging the leaven out of His people and building new loaf of bread that He can be pleased with!