Numbers 35:11-14

BSB(i) 11 designate cities to serve as your cities of refuge, so that a person who kills someone unintentionally may flee there. 12 You are to have these cities as a refuge from the avenger, so that the manslayer will not die until he stands trial before the assembly. 13 The cities you select will be your six cities of refuge. 14 Select three cities across the Jordan and three in the land of Canaan as cities of refuge.