Exodus 12:9-14

Do not eat any of it raw or boiled in water, but roasted in fire—both its head and its legs, along with its inner parts. You shall let none of the meat remain until the morning, and anything that remains left over until morning, you shall burn completely in the fire. Now you are to eat it in this manner: [be prepared for a journey] with your loins girded [that is, with the outer garment tucked into the band], your sandals on your feet, and your staff in your hand; you shall eat it quickly—it is the LORD’S Passover. For I [the LORD] will pass through the land of Egypt on this night, and will strike down all the firstborn in the land of Egypt, both man and animal; against all the gods of Egypt I will execute judgments [exhibiting their worthlessness]. I am the LORD. The blood shall be a sign for you on [the doorposts of] the houses where you live; when I see the blood I shall pass over you, and no affliction shall happen to you to destroy you when I strike the land of Egypt. [1 Cor 5:7; Heb 11:28] ‘Now this day will be a memorial to you, and you shall keep it as a feast to the LORD; throughout your generations you are to celebrate it as an ordinance forever.