Exodus 12:1-4 New Revised Standard Version (NRSV)

The First Passover Instituted

12 The Lord said to Moses and Aaron in the land of Egypt: 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 neighbor in obtaining one; the lamb shall be divided in proportion to the number of people who eat of it.