Numbers 35:15-24

MLV(i) 15 For the sons of Israel and for the stranger and for the traveler among them, these six cities will be for refuge, that everyone who kills any person unwittingly may flee there.
16 But if he killed* him with an instrument of iron, so that he died, he is a murderer. The murderer will surely be put to death. 17 And if he killed* him with a stone in the hand, by which a man may die and he died, he is a murderer. The murderer will surely be put to death. 18 Or if he killed* him with a weapon of wood in the hand, by which a man may die and he died, he is a murderer. The murderer will surely be put to death.
19 The avenger of blood will himself put the murderer to death. When he meets him, he will put him to death. 20 And if he thrust him from hatred, or hurled at him, lying in wait, so that he died, 21 or in enmity killed* him with his hand, so that he died, he who killed* him will surely be put to death. He is a murderer. The avenger of blood will put the murderer to death, when he meets him.
22 But if he thrust him suddenly without enmity, or hurled upon him anything without lying in wait, 23 or with any stone, by which a man may die, not seeing him and cast it upon him, so that he died and he was not his enemy, nor sought his harm, 24 then the congregation will judge between the slayer and the avenger of blood according to these ordinances.