1 Corinthians 5:7-8

Etheridge(i) 7 Purge from you the old leaven, that you may be a new mass; so that you may be (as) unleavened bread. For our Pascha is the Meshiha, who hath been slain for us. 8 Therefore, let us perform the festival, not with the old leaven, nor with the leaven of wickedness and animosity, but with the unleavened bread of purity and of holiness.