Numbers 35:9-12
The Cities of Refuge
35:9 Then the Lord spoke to Moses:
35:10 “Speak to the Israelites and tell them, ‘When you cross over the Jordan River into the land of Canaan,
35:11 you must then designate some towns as towns of refuge for you, to which a person who has killed someone unintentionally may flee.
35:12 And they must stand as your towns of refuge from the avenger in order that the killer may not die until he has stood trial before the community.