1 Corinthians 5:7-10

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: {is sacrificed; or, is slain} 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. {the feast: or, holyday} I wrote unto you in an epistle not to company with fornicators: Yet not altogether with the fornicators of this world, or with the covetous, or extortioners, or with idolaters; for then must ye needs go out of the world.