Numbers 35:19-21

19the avenger of blood, he shall put the murderer to death; when he meeteth him, he shall put him to death.

20And if he thrust at him out of hatred, or hurl at him intentionally, so that he die,

21or from enmity smite him with his hand, so that he die, he that smote him shall certainly be put to death; he is a murderer: the avenger of blood shall put the murderer to death, when he meeteth him. —