Exodus 12:3-8

3Tell the whole community of Israel that on the tenth day of this month they must each select an animal of the flock according to their fathers’ families, one animal per family.

4If the household is too small for a whole animal, that person and the neighbor nearest his house are to select one based on the combined number of people; you should apportion the animal according to what each will eat.

5You must have an unblemished animal, a year-old male; you may take it from either the sheep or the goats.

6You are to keep it until the fourteenth day of this month; then the whole assembly of the community of Israel will slaughter the animals at twilight.

7They must take some of the blood and put it on the two doorposts and the lintel of the houses where they eat them.

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