Numbers 35:6-8

6And among the cities which ye shall give to the Levites there shall be six cities for refuge, which ye shall appoint for the manslayer, that he may flee there: and to them ye shall add forty and two cities.1 7So all the cities which ye shall give to the Levites shall be forty and eight cities: them shall ye give with their common lands. 8And the cities which ye shall give shall be of the possession of the children of Israel: from them that have many ye shall give many; but from them that have few ye shall give few: every one shall give of his cities to the Levites according to his inheritance which he inheriteth.2