Joshua 20:5

3that the man slayer who kills any person accidentally or unintentionally may flee there. They shall be to you for a refuge from the avenger of blood.

4He shall flee to one of those cities, and shall stand at the entrance of the gate of the city, and declare his case in the ears of the elders of that city. They shall take him into the city with them, and give him a place, that he may live among them.

5If the avenger of blood pursues him, then they shall not deliver up the man slayer into his hand; because he struck his neighbor unintentionally, and didn’t hate him before.

6He shall dwell in that city until he stands before the congregation for judgment, until the death of the high priest that shall be in those days. Then the man slayer shall return, and come to his own city, and to his own house, to the city he fled from.’”

7They set apart Kedesh in Galilee in the hill country of Naphtali, Shechem in the hill country of Ephraim, and Kiriath Arba (also called Hebron) in the hill country of Judah.