Exodus 12:2-4

New Revised Standard Version, Anglicised Catholic Edition

² This month shall mark for you the beginning of months; it shall be the first month of the year for you. ³ Tell the whole congregation of Israel that on the tenth of this month they are to take a lamb for each family, a lamb for each household. ⁴ If a household is too small for a whole lamb, it shall join its closest neighbour in obtaining one; the lamb shall be divided in proportion to the number of people who eat of it.