Exodus 12:1-4

Now the Lord said to Moses and Aaron in the land of Egypt,

“This month shall be the beginning of months for you; it is to be the first month of the year for you.

Speak to all the congregation of Israel, saying, ‘On the tenth of this month they are, each one, to take a lamb for themselves, according to the fathers’ households, a lamb for each household.

Now if the household is too small for a lamb, then he and his neighbor nearest to his house are to take one according to the number of persons in them; in proportion to what each one should eat, you are to divide the lamb.