Numbers 35:12-19

12And they must stand as your towns of refuge from the avenger in order that the killer may not die until he has stood trial before the community.

13These towns that you must give shall be your six towns for refuge.

14“You must give three towns on this side of the Jordan, and you must give three towns in the land of Canaan; they must be towns of refuge.

15These six towns will be places of refuge for the Israelites, and for the foreigner, and for the settler among them, so that anyone who kills any person accidentally may flee there.

16“But if he hits someone with an iron tool so that he dies, he is a murderer. The murderer must surely be put to death.

17If he strikes him by throwing a stone large enough that he could die, and he dies, he is a murderer. The murderer must surely be put to death.

18Or if he strikes him with a wooden hand weapon so that he could die, and he dies, he is a murderer. The murderer must surely be put to death.

19The avenger of blood himself must kill the murderer; when he meets him, he must kill him.