Numbers 35:16-24, 30-31

‘But if he struck his victim down [intentionally] with an iron object so that he died, he is a murderer; the murderer shall certainly be put to death. If he struck his victim down [intentionally] with a stone in hand, which may cause a person to die, and he died, he is a murderer; the murderer shall certainly be put to death. Or if he struck his victim down [intentionally] with a wooden object in hand, which may cause a person to die, and he died, he is a murderer; the murderer shall certainly be put to death. The blood avenger shall himself put the murderer to death; he shall put him to death when he meets him. But if he pushed his victim out of hatred or threw something at him with malicious intent, and he died, or if, in enmity, he struck the victim down with his hand, and he died, the one that struck the victim shall certainly be put to death; he is a murderer. The blood avenger shall put the murderer to death when he meets him. ‘But if he pushed the victim suddenly, not in enmity, or threw anything at him without malicious intent, or without seeing him hit him [accidentally] with a stone object that could kill him, and he died, and [the offender] was not his enemy nor intending to harm him, then the congregation shall judge between the offender and the blood avenger according to these ordinances.

‘If anyone kills a person [intentionally], the murderer shall be put to death on the testimony of [two or more] witnesses; but no one shall be put to death on the testimony of [only] one witness. Moreover, you shall not accept a ransom [in exchange] for the life of a murderer guilty and sentenced to death; but he shall certainly be put to death.