Numbers 35:6-8

6And the cities which ye shall give unto the Levites, they shall be the six cities of refuge, which ye shall give for the manslayer to flee unto: and besides them ye shall give forty and two cities. 7All the cities which ye shall give to the Levites shall be forty and eight cities; them shall ye give with their suburbs. 8And concerning the cities which ye shall give of the possession of the children of Israel, from the many ye shall take many; and from the few ye shall take few: every one according to his inheritance which he inheriteth shall give of his cities unto the Levites.