Deuteronomy 19:2-4

Common English Bible

² you must designate three cities for your use in the land the Lord your God is giving you to possess. ³ Mark out the roads to them^[a] and divide the regions of the land the Lord your God is apportioning to you into three parts. These cities are the places to which a person who has killed can escape. ⁴ Here is the rule concerning a person who killed someone and is permitted to escape to one of these cities and live:

If it is someone who killed his neighbor accidentally, without having hated that person previously;