Num Numbers, chapter Book of Numbers, chapter 35
And if he pushes him in hatred, or has cast [anything] at him by lying in wait, and he dies, Deu 19:11or he has struck him with his hand in enmity, and he dies, the striker is certainly put to death; he [is] a murderer; the redeemer of blood puts the murderer to death in his coming against him. Deu 19:12