1 Corinthians 5:6-8

UKJV(i) 6 Your glorying is not good. Know all of you not that a little leaven leavens the whole lump? 7 Purge out therefore the old leaven, that all of you may be a new lump, as all of you 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.