Numbers 35:12-19

12They shall be cities of refuge for you from the avenger, that the manslayer may not die until he stands before the congregation in judgment.

13And of the cities which you give, you shall have six cities of refuge.

14You shall appoint three cities on this side of the Jordan, and three cities you shall appoint in the land of Canaan, which will be cities of refuge.

15These six cities shall be for refuge for the children of Israel, for the stranger, and for the sojourner among them, that anyone who kills a person accidentally may flee there.

16‘But if he strikes him with an iron implement, so that he dies, he is a murderer; the murderer shall surely be put to death.

17And if he strikes him with a stone in the hand, by which one could die, and he does die, he is a murderer; the murderer shall surely be put to death.

18Or if he strikes him with a wooden hand weapon, by which one could die, and he does die, he is a murderer; the murderer shall surely be put to death.

19The avenger of blood himself shall put the murderer to death; when he meets him, he shall put him to death.