Hesabu 35 : 18 Numbers chapter 35 verse 18

Au kama alimpiga kwa chombo cha mti kilichokuwa mkononi mwake ambacho kwa hicho humkini mtu kufa, naye akafa, ni mwuaji huyo, mwuaji lazima atauawa.
soma Mlango wa 35

Or if he struck him with a weapon of wood in the hand, by which a man may die, and he died, he is a murderer: the murderer shall surely be put to death.