Numbers 35:12, 21, 24, 27

These cities will be places of protection from a dead person’s relatives who want to avenge the death. The slayer must not be put to death before being tried by the community.

Or if someone hates another person and hits him with a fist and he dies, it is murder. In such cases, the avenger must put the murderer to death when they meet.

If this should happen, the community must follow these regulations in making a judgment between the slayer and the avenger, the victim’s nearest relative

and the avenger finds him outside the city and kills him, it will not be considered murder.