Numbers 35:12-19

12They are to be cities for refuge from the avenger, so the manslayer may not die before standing trial before the assembly.

13The six cities you designate are to be your cities of refuge.

14Designate three cities on this side of the Jordan and three in the land of Canaan as cities of refuge.

15“These six cities of refuge are to be for Bnei-Yisrael as well as for the outsider and the visitor in their midst, for anyone killing a person by accident.

16Now if the manslayer strikes someone with an iron object so that he dies, he is a murderer and the murderer must die.

17If anyone has a stone in his hand that could be deadly and strikes anyone with it so that he dies, he is a murderer and the murderer must die.

18Or if someone has a wooden object that could kill and strikes anyone so that he dies, he is a murderer and the murderer must be put to death.

19The blood avenger himself may put the murderer to death. When he finds him, he is to kill him.