Joshua 20:3
Anyone who kills someone accidentally and unintentionally may go there for a refuge from the avenger of blood.
Treasury of Scripture Knowledge
Summary
That the slayer that killeth any person unawares and unwittingly may flee thither: and they shall be your refuge from the avenger of blood.
General references
Bible References
General references
Numbers 35:19
The relative who can avenge the death must make sure a murderer is put to death. When he catches up with the murderer, he must kill him.