Exodus 12:3-8

3Speak unto all the assembly of Israel, saying, On the tenth of this month let them take themselves each a lamb, for a father's house, a lamb for a house.

4And if the household be too small for a lamb, let him and his neighbour next unto his house take [it] according to the number of the souls; each according to [the measure] of his eating shall ye count for the lamb.

5Your lamb shall be without blemish, a yearling male; ye shall take [it] from the sheep, or from the goats.

6And ye shall keep it until the fourteenth day of this month; and the whole congregation of the assembly of Israel shall kill it between the two evenings.

7And they shall take of the blood, and put [it] on the two door-posts and on the lintel of the houses in which they eat it.

8And they shall eat the flesh in that night, roast with fire, and unleavened bread; with bitter [herbs] shall they eat it.