Joshua 20:5-6

20:5 When the avenger of blood comes after him, they must not hand over to him the one who committed manslaughter, for he accidentally killed his fellow man without premeditation. 20:6 He must remain in that city until his case is decided by the assembly and the high priest dies. Then the one who committed manslaughter may return home to the city from which he escaped.”

Joshua 21:32

21:32 from the tribe of Naphtali: Kedesh in Galilee (a city of refuge for one who committed manslaughter), Hammoth Dor, and Kartan, along with the grazing areas of each – a total of three cities.

Joshua 22:17

22:17 The sin we committed at Peor was bad enough. To this very day we have not purified ourselves; it even brought a plague on the community of the Lord.