Numbers 35:22 WEB

²⁰  If he thrust him of hatred, or hurled at him, lying in wait, so that he died,

²¹  or in enmity struck him with his hand, so that he died; he who struck him shall surely be put to death; he is a murderer: the avenger of blood shall put the murderer to death, when he meets him.

²²  But if he thrust him suddenly without enmity, or hurled on him anything without lying in wait,

²³  or with any stone, by which a man may die, not seeing him, and cast it on him, so that he died, and he was not his enemy, neither sought his harm;

²⁴  then the congregation shall judge between the striker and the avenger of blood according to these ordinances;