Exodus 12:18-20

18 aIn the first month, from the fourteenth day of the month at evening, you shall eat unleavened bread until the twenty-first day of the month at evening. 19 bFor seven days no leaven is to be found in your houses. If anyone eats what is leavened, cthat person will be cut off from the congregation of Israel, dwhether he is a sojourner or a native of the land. 20You shall eat nothing leavened; in all your dwelling places you shall eat unleavened bread.”

Leviticus 2:11

11“No grain offering that you bring to the Lord shall be made with eleaven, for you shall burn no leaven nor any honey as a food offering to the Lord.

1 Corinthians 5:6-8

6 fYour boasting is not good. Do you not know that ga little leaven leavens the whole lump? 7Cleanse out the old leaven that you may be a new lump, as you really are unleavened. For Christ, our Passover lamb, has been sacrificed. 8Let us therefore celebrate the festival, hnot with the old leaven, ithe leaven of malice and evil, but with the unleavened bread of sincerity and truth.

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