1 Corinthians 5:6-8
New International Version
6 Your boasting is not good.(A) Don’t you know that a little yeast(B) leavens the whole batch of dough?(C) 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.(D) 8 Therefore let us keep the Festival, not with the old bread leavened with malice and wickedness, but with the unleavened bread(E) of sincerity and truth.