Hesabu 35 : 11 Numbers chapter 35 verse 11

Ndipo mtajiwekea miji iwe miji ya makimbilio kwa ajili yenu; ili kwamba mwenye kumwua mtu, pasipo kukusudia kumwua, apate kukimbilia huko.
soma Mlango wa 35

then you shall appoint you cities to be cities of refuge for you, that the manslayer who kills any person unwittingly may flee there.