Numbers 35:16-24, 30-31

“But if someone strikes and kills another person with a piece of iron, it is murder, and the murderer must be executed. Or if someone with a stone in his hand strikes and kills another person, it is murder, and the murderer must be put to death. Or if someone strikes and kills another person with a wooden object, it is murder, and the murderer must be put to death. The victim’s nearest relative is responsible for putting the murderer to death. When they meet, the avenger must put the murderer to death. So if someone hates another person and waits in ambush, then pushes him or throws something at him and he dies, it is murder. Or if someone hates another person and hits him with a fist and he dies, it is murder. In such cases, the avenger must put the murderer to death when they meet. “But suppose someone pushes another person without having shown previous hostility, or throws something that unintentionally hits another person, or accidentally drops a huge stone on someone, though they were not enemies, and the person dies. If this should happen, the community must follow these regulations in making a judgment between the slayer and the avenger, the victim’s nearest relative

“All murderers must be put to death, but only if evidence is presented by more than one witness. No one may be put to death on the testimony of only one witness. Also, you must never accept a ransom payment for the life of someone judged guilty of murder and subject to execution; murderers must always be put to death.