Numbers 35:12
12 The cities shall be for you a refuge from the avenger, that the manslayer may not die until he stands before the congregation for judgment.
Numbers 35:24–25
24 then hthe congregation shall judge between the manslayer and ethe avenger of blood, in accordance with these rules. 25 And the congregation shall rescue the manslayer from the hand of the avenger of blood, and the congregation shall restore him to his city of refuge to which he had fled, and he shall live in it iuntil the death of the high priest jwho was anointed with the holy oil.