Exodus 12:7, 11-12

They are to take some of the blood and smear it on the sides and top of the doorframes of the houses where they eat the animal.

“These are your instructions for eating this meal: Be fully dressed, wear your sandals, and carry your walking stick in your hand. Eat the meal with urgency, for this is the LORD’s Passover. On that night I will pass through the land of Egypt and strike down every firstborn son and firstborn male animal in the land of Egypt. I will execute judgment against all the gods of Egypt, for I am the LORD!