Exodus 12:10

They shall take some of the blood, and put it on the two door posts and on the lintel, on the houses in which they shall eat it.

They shall eat the meat in that night, roasted with fire, with unleavened bread. They shall eat it with bitter herbs.

Don’t eat it raw, nor boiled at all with water, but roasted with fire; with its head, its legs and its inner parts.

This is how you shall eat it: with your belt on your waist, your sandals on your feet, and your staff in your hand; and you shall eat it in haste: it is the LORD’s Passover.

For I will go through the land of Egypt in that night, and will strike all the firstborn in the land of Egypt, both man and animal. I will execute judgments against all the gods of Egypt. I am the LORD.

The blood shall be to you for a token on the houses where you are. When I see the blood, I will pass over you, and no plague will be on you to destroy you when I strike the land of Egypt.