Exodus 12:15-17

15For 1seven days you shall eat unleavened bread, but on the first day you shall remove dough with yeast from your houses; for whoever eats anything with yeast from the first day until the seventh day, 2that 3person shall be cut off from Israel.

16And 4on the first day you shall have a holy assembly, and another holy assembly on the seventh day; no work at all shall be done on them, except for what must be eaten by every person--that alone may be 5prepared by you.

17You shall also keep 6the Feast of Unleavened Bread, for on this 7very day I brought your 8multitudes out of the land of Egypt; therefore you shall keep this day throughout your generations as 9a 10permanent ordinance.