1 Corinthians 5:6–8

6 Your boasting is not good.t Don’t you know that a little yeastu leavens the whole batch of dough?v 7 Get rid of the old yeast, so that you may be a new unleavened batch—as you really are. For Christ, our Passover lamb, has been sacrificed.w 8 Therefore let us keep the Festival, not with the old bread leavened with malice and wickedness, but with the unleavened breadx of sincerity and truth.