Deuteronomy 19:11-13

11Suppose someone hates another person, waits in ambush for him, attacks him, takes his life, and runs to one of these cities.

12If someone does this, the leaders of your city must send for that person. They must take him from that city and hand him over to the relative who has the authority to avenge the death. He must die.

13They must have no pity on him. The guilt of murdering an innocent person must be removed from Israel. Then things will go well for Israel.