Exodus 12:12-17

12On that night I will pass through the land of Egypt and strike down every firstborn male, both man and beast, and I will execute judgment against all the gods of Egypt. I am the LORD. 13The blood on the houses where you are staying will be a sign; when I see the blood, I will pass over you. No plague will fall on you to destroy you when I strike the land of Egypt.

14And this day will be a memorial for you, and you are to celebrate it as a feast to the LORD, as a permanent statute for the generations to come. 15For seven days you must eat unleavened bread. On the first day you are to remove the leaven from your houses. Whoever eats anything leavened from the first day through the seventh must be cut off from Israel.

16On the first day you are to hold a sacred assembly, and another on the seventh day. You must not do any work on those days, except to prepare the meals—that is all you may do.

17So you are to keep the Feast of Unleavened Bread,1 for on this very day I brought your divisions out of the land of Egypt. You must keep this day as a permanent statute for the generations to come.