Deuteronomy 19:6, 12

Otherwise, the dead person’s relative who has the duty of punishing a murderer might be angry and chase him. If the city is far away, the relative might catch and kill the person, even though he should not be killed because there was no intent to kill his neighbor.

the elders of his own city should send for the murderer. They should bring the person back from the city of safety and hand him over to the relative who has the duty of punishing the murderer.