"And among the cities which ye shall give unto the Levites, there shall be six cities of franchise which ye shall give to that intent that he which committeth a slaughter, may fly thither. And to them ye shall add forty two cities more:

after the number of the days in which ye searched out the land forty days, and every day a year: so that they shall bear your unrighteousness forty years, and ye shall feel my vengeance.