Exodus 12:3-8

³Speak ye unto all the congregation of Israel, saying, On the tenth day of this month they shall take to themselves every man a lamb for every family, a lamb for every house:

⁴And if the household be too small for a lamb, then shall he take it with his neighbor who is next unto his house, according to the number of the souls; every man according to what he eateth shall ye make a count for the lamb.

⁵A lamb without blemish, a male of the first year shall ye have; from the sheep, or from the goats may ye take it.

⁶And ye shall have it in keeping until the fourteenth day of the same month; and then the whole assembly of the congregation of Israel shall kill it toward evening.

⁷And they shall take of the blood, and put it on the two side-posts and on the upper door-post, in the houses, wherein they shall eat it.

⁸And they shall eat the flesh in that night, roasted by the fire, with unleavened bread; together with bitter herbs shall they eat it.