Exodus 12:7-13

7And they shall take of the blood, and put it on the two side posts and on the lintel, upon the houses wherein they shall eat it.

8And they shall eat the flesh in that night, roast with fire, and unleavened bread; with bitter herbs they shall eat it.

9Eat not of it raw, nor sodden at all with water, but roast with fire; its head with its legs and with the inwards thereof.

10And ye shall let nothing of it remain until the morning; but that which remaineth of it until the morning ye shall burn with fire.

11And thus shall ye eat it; with your loins girded, your shoes on your feet, and your staff in your hand: and ye shall eat it in haste: it is the LORD’S passover,

12For I will go through the land of Egypt in that night, and will smite all the firstborn in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgments: I am the LORD.

13And the blood shall be to you for a token upon the houses where ye are: and when I see the blood, I will pass over you, and there shall no plague be upon you to destroy you, when I smite the land of Egypt.