Free Yourselves of Fornicators

I Corinthians 5:6-8

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: 
8  Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.