Numbers 35:16-18

‘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. And 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. Or 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.