Leviticus 4:2
"Tell the sons of Israel to do as follows with one who sins unintentionally against any of the LORD's commandments and does what is forbidden by them:

Numbers 35:12
You are to have these cities as a refuge from the avenger, so that the manslayer will not die until he stands trial before the assembly.

Joshua 20:2
"Tell the Israelites to designate the cities of refuge, as I instructed you through Moses,

Joshua 20:4
When someone flees to one of these cities, stands at the entrance of the gate of the city, and states his case before its elders, they are to bring him into the city and give him a place to live among them.