Exodus 12:20

20You shall eat nothing leavened; in all your dwelling places you shall eat unleavened bread.”

Exodus 23:18

18 a“You shall not offer the blood of my sacrifice with anything leavened, or let the fat of my feast remain until the morning.

Deuteronomy 16:3

3You shall eat no leavened bread with it. bSeven days you shall eat it with unleavened bread, the bread of afflictionfor you came out of the land of Egypt cin hastethat all the days of your life you may remember the day when you came out of the land of Egypt.

1 Corinthians 5:7-8

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, dnot with the old leaven, ethe leaven of malice and evil, but with the unleavened bread of sincerity and truth.

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