Exodus 12:3-8

3Tell all the congregation of Israel that on the tenth day of this month every man shall take a lamb according to their fathers' houses, a lamb for a household.

4And if the household is too small for a lamb, then he and his nearest neighbor shall take according to the number of persons; according to what each can eat you shall make your count for the lamb.

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

6and you shall keep it until the fourteenth day of this month, when the whole assembly of the congregation of Israel shall kill their lambs at twilight.

7"Then they shall take some of the blood and put it on the two doorposts and the lintel of the houses in which they eat it.

8They shall eat the flesh that night, roasted on the fire; with unleavened bread and bitter herbs they shall eat it.