Exodus 12:8

4 If the household is too small for a whole lamb, they are to share with the nearest neighbor based on the number of people, and apportion the lamb accordingly.

5 Your lamb must be an unblemished year-old male, and you may take it from the sheep or the goats.

6 You must keep it until the fourteenth day of the month, when the whole assembly of the congregation of Israel will slaughter the animals at twilight.

7 They are to take some of the blood and put it on the sides and tops of the doorframes of the houses where they eat the lambs.

8 They are to eat the meat that night, roasted over the fire, along with unleavened bread and bitter herbs.

9 Do not eat any of the meat raw or cooked in boiling water, but only roasted over the fire—its head and legs and inner parts.

10 Do not leave any of it until morning; before the morning you must burn up any part that is left over.

11 This is how you are to eat it: You must be fully dressed for travel, with your sandals on your feet and your staff in your hand. You are to eat in haste; it is the LORD’s Passover.

12 On that night I will pass through the land of Egypt and strike down every firstborn male, both man and beast, and I will execute judgment against all the gods of Egypt. I am the LORD.

Read all of Exodus 12