Numbers 35:19 in the World English Bible
The avenger of blood shall himself put the murderer to death. When he meets him, he shall put him to death.
Context
18 Or if he smite him with an hand weapon of wood, wherewith he may die, and he die, he is a murderer: the murderer shall surely be put to death.
19 The revenger of blood himself shall slay the murderer: when he meeteth him, he shall slay him.
20 But if he thrust him of hatred, or hurl at him by laying of wait, that he die;