Hesabu 35 : 17 Numbers chapter 35 verse 17

Na kama alimpiga kwa jiwe lililokuwa mkononi mwake, ambalo kwa hilo humkini mtu kufa, naye akafa, yeye ni mwuaji; huyo mwuaji lazima atauawa.
soma Mlango wa 35

If he struck him with a stone in the hand, by which a man may die, and he died, he is a murderer: the murderer shall surely be put to death.