Exodus 12:12-17

12For 1I will go through the land of Egypt on that night, and will strike down all the firstborn in the land of Egypt, both man and beast; and 2against all the gods of Egypt I will execute judgments--3I am the Lord. 134The blood shall be a sign for you on the houses where you 5live; and when I see the blood I will pass over you, and no plague will befall you 6to destroy you when I strike the land of Egypt.

14‘Now 7this day will be 8a memorial to you, and you shall celebrate it as a feast to the Lord; throughout your generations you are to celebrate it as 910a permanent ordinance. 1511Seven days you shall eat unleavened bread, but on the first day you shall 12remove leaven from your houses; for whoever eats anything leavened from the first day until the seventh day, 13that 14person shall be cut off from Israel. 1615On 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 what must be eaten 16by every person, that alone may be 17prepared by you. 17You shall also observe 18the Feast of Unleavened Bread, for on this 19very day I brought your hosts out of the land of Egypt; therefore you shall observe this day throughout your generations as 20a 21permanent ordinance.