Exodus 12:15-20

15 "'For seven days you are to eat matzah - on the first day remove the leaven from your houses. For whoever eats hametz [leavened bread] from the first to the seventh day is to be cut off from Isra'el.
16 On the first and seventh days, you are to have an assembly set aside for God. On these days no work is to be done, except what each must do to prepare his food; you may do only that.
17 You are to observe the festival of matzah, for on this very day I brought your divisions out of the land of Egypt. Therefore, you are to observe this day from generation to generation by a perpetual regulation.
18 From the evening of the fourteenth day of the first month until the evening of the twenty-first day, you are to eat matzah.
19 During those seven days, no leaven is to be found in your houses. Whoever eats food with hametz in it is to be cut off from the community of Isra'el - it doesn't matter whether he is a foreigner or a citizen of the land.
20 Eat nothing with hametz in it. Wherever you live, eat matzah.'"
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