Hesabu 35 : 27 Numbers chapter 35 verse 27

na mwenye kutwaa kisasi cha damu akamwona, naye yu nje ya mpaka wa mji wake wa makimbilio, na mwenye kutwaa kisasi cha damu akamwua huyo mwuaji, hatakuwa na hatia ya damu;
soma Mlango wa 35

and the avenger of blood find him outside of the border of his city of refuge, and the avenger of blood kill the manslayer; he shall not be guilty of blood,