Exodus 12:12-17

12For 1I will go through the land of Egypt on that night, and fatally strike all the firstborn in the land of Egypt, from the human firstborn to animals; 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 come upon you 6to destroy you when I strike the land of Egypt.

14‘Now 7this day shall 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. 15For 11seven 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, 12that 13person shall be cut off from Israel. 16And 14on 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 15prepared by you. 17You shall also keep 16the Feast of Unleavened Bread, for on this 17very day I brought your 18multitudes out of the land of Egypt; therefore you shall keep this day throughout your generations as 19a 20permanent ordinance.