Exodus 12:13-15

Living Bible

¹³ The blood you have placed on the doorposts will be proof that you obey me, and when I see the blood I will pass over you and I will not destroy your firstborn children when I smite the land of Egypt.

¹⁴ “You shall celebrate this event each year (this is a permanent law) to remind you of this fatal night. ¹⁵ The celebration shall last seven days. For that entire period you are to eat only bread made without yeast. Anyone who disobeys this rule at any time during the seven days of the celebration shall be excommunicated from Israel.