Exodus 12:14-15

14This day shall be afor you a memorial day, and you shall keep it as a feast to the Lord; throughout your generations, as a bstatute forever, you shall keep it as a feast. 15 cSeven days you shall eat unleavened bread. On the first day you shall remove leaven out of your houses, for if anyone eats what is leavened, from the first day until the seventh day, dthat person shall be cut off from Israel.
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