Numbers 35:9-12

9The Lord said to Moses,

10‘Tell the Israelites to do this when they cross the Jordan River and they go into Canaan.

11They must choose some towns to be safe places. If anyone kills another person but he did not mean to, he can run there to be safe.

12Those towns will be places where the killer can be safe from the dead person's relative. The killer will not die before the people in the town have judged him.