1 Corinthians 5:7-8

Diaglott(i) 7 Cleanse out the old leaven, that you may be new mass, as you are unleavened; even for the paschal lamb of us on behalf of us was slain, Anointed. 8 Therefore let us keep the feast, not with leaven old, nor with leaven of vice and wickedness, but with unleavened things of sincerity and of truth.