Numbers 35:2

35:2 “Instruct the Israelites to give the Levites towns to live in from the inheritance the Israelites will possess. You must also give the Levites grazing land around the towns.

Numbers 35:32

35:32 And you must not accept a ransom for anyone who has fled to a town of refuge, to allow him to return home and live on his own land before the death of the high priest.