Exodus 12:7, 11-12

And they shall take some of the blood and put it on the two doorposts and on the lintel of the houses where they eat it.

And thus you shall eat it: with a belt on your waist, your sandals on your feet, and your staff in your hand. So you shall eat it in haste. It is the LORD’s Passover. ‘For I will pass through the land of Egypt on that night, and will strike all the firstborn in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgment: I am the LORD.