Numbers 35:16-19

35:16 “But if he hits someone with an iron tool so that he dies, he is a murderer. The murderer must surely be put to death. 35:17 If he strikes him by throwing a stone large enough that he could die, and he dies, he is a murderer. The murderer must surely be put to death. 35:18 Or if he strikes him with a wooden hand weapon so that he could die, and he dies, he is a murderer. The murderer must surely be put to death. 35:19 The avenger of blood himself must kill the murderer; when he meets him, he must kill him.

Numbers 35:21

35:21 or with enmity he strikes him with his hand and he dies, the one who struck him must surely be put to death, for he is a murderer. The avenger of blood must kill the murderer when he meets him.

Numbers 35:30-31

35:30 “Whoever kills any person, the murderer must be put to death by the testimony of witnesses; but one witness cannot testify against any person to cause him to be put to death. 35:31 Moreover, you must not accept a ransom for the life of a murderer who is guilty of death; he must surely be put to death.