Exodus 12:10-14

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.

14And this day shall be unto you for a memorial, and ye shall keep it a feast to the LORD: throughout your generations ye shall keep it a feast by an ordinance for ever.