Exodus 12:3-8

3Tell all the congregation of Israel that on the tenth day of this month, each man is to take a lamb for his family one lamb for the household.

4But if the household is too small for a lamb, then he and his nearest neighbor are to take one according to the number of the people. According to each person eating, you are to make your count for the lamb.

5Your lamb is to be without blemish, a year old male. You may take it from the sheep or from the goats.

6You must watch over it until the fourteenth day of the same month. Then the whole assembly of the congregation of Israel is to slaughter it at twilight.

7They are to take the blood and put it on the two doorposts and on the crossbeam of the houses where they will eat it.

8They are to eat the meat that night, roasted over a fire. With matzot and bitter herbs they are to eat it.