Exodus 12:3-6

3Speak ye to all the congregation of Israel, saying, In the tenth day of this month they shall take to them every man a lamb, according to the house of their fathers, a lamb for an house:1

4And if the household shall be too small for the lamb, let him and his neighbour next to his house take it according to the number of the souls; every man according to his eating shall make your count for the lamb.

5Your lamb shall be without blemish, a male of the first year: ye shall take it from the sheep, or from the goats:2

6And ye shall keep it until the fourteenth day of the same month: and the whole assembly of the congregation of Israel shall kill it in the evening.3