Treasury of Scripture Knowledge
You will have the cities as a refuge from the avenger, so that the one who kills someone will not die until he stands trial before the assembly.
Otherwise, the avenger of blood in the heat of his anger
might pursue the one who committed manslaughter, overtake him because the distance is great, and strike him dead. Yet he did not deserve to die, since he did not previously hate his neighbor.
so that a person who kills someone unintentionally or accidentally may flee there. These will be your refuge from the avenger of blood.