Exodus 12:3-8

3Tell all the congregation of Israel, ‘On the tenth [day] of this month they are to take a lamb or young goat for themselves, according to [the size of] the household of which he is the father, a lamb or young goat for each household.

4Now if the household is too small for a lamb [to be consumed], let him and his next door neighbor take one according to the number of people [in the households]; according to what each man can eat, you are to divide the lamb.

5Your lamb or young goat shall be [perfect] without blemish or bodily defect, a male a year old; you may take it from the sheep or from the goats.

6You shall keep it until the fourteenth day of the same month, then the whole assembly of the congregation of Israel is to slaughter it at twilight.

7Moreover, they shall take some of the blood and put it on the two doorposts and on the lintel [above the door] of the houses in which they eat it.

8They shall eat the meat that same night, roasted in fire, and they shall eat it with unleavened bread and bitter herbs.