Anyone who accidentally kills someone can escape there; ¹  these cities will be a place of asylum from the avenger of blood.

So to the descendants of Aaron the priest they assigned Hebron (a city of refuge for one who committed manslaughter), Libnah,

They assigned them Shechem (a city of refuge for one who committed manslaughter) in the hill country of Ephraim, Gezer,

from the tribe of Gad: Ramoth in Gilead (a city of refuge for one who committed manslaughter), Mahanaim,

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. ¹ 

He must remain ¹  in that city until his case is decided by the assembly ²  and the high priest dies. ³  Then the one who committed manslaughter may return home to the city from which he escaped.” ⁴ 

They assigned to the Gershonite clans of the Levites the following cities: ¹  from the half-tribe of Manasseh: Golan in Bashan (a city of refuge for one who committed manslaughter) and Beeshtarah, along with the grazing areas of each – a total of two cities;

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.