Numbers 35:6-8

Complete Jewish Bible

⁶ The cities you give to the L’vi’im are to be the six cities of refuge to which you permit the person who kills someone to flee to; plus an additional forty-two cities. ⁷ Thus you will give the L’vi’im forty-eight cities, with their surrounding open land. ⁸ As to the cities you will give from those the people of Isra’el possess, from the many you will take many, and from the few you will take few — each tribe will contribute from its cities to the L’vi’im in accordance with the size of its inheritance.”