Numbers 35:16-22

16If, however, anyone strikes a person with an iron object and kills him, he is a murderer; the murderer must surely be put to death. 17Or if anyone has in his hand a stone of deadly size, and he strikes and kills another, he is a murderer; the murderer must surely be put to death. 18If anyone has in his hand a deadly object of wood, and he strikes and kills another, he is a murderer; the murderer must surely be put to death.

19The avenger of blood is to put the murderer to death; when he finds him, he is to kill him.

20Likewise, if anyone maliciously pushes another or intentionally throws an object at him and kills him, 21or if in hostility he strikes him with his hand and he dies, the one who struck him must surely be put to death; he is a murderer. When the avenger of blood finds the murderer, he is to kill him.

22But if anyone pushes a person suddenly, without hostility, or throws an object at him unintentionally,