Deuteronomy 4:42
to which a manslayer could flee after killing his neighbor unintentionally without prior malice.
What it says
A manslayer who killed a neighbor unintentionally and without prior malice could flee there and live.
What it is doing
It states the purpose of the cities as protection for accidental killing.
In context
41Then Moses set aside three cities across the Jordan to the east 42to which a manslayer could flee after killing his neighbor unintentionally without prior malice. 43To save one’s own life, he could flee to one of these cities: Bezer in the wilderness on the plateau belonging to the Reubenites, Ramoth in Gilead belonging to the Gadites, or Golan in Bashan belonging to the Manassites.