Numbers 35:21-23

Revised Standard Version

²¹ or in enmity struck him down with his hand, so that he died, then he who struck the blow shall 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 stabbed him suddenly without enmity, or hurled anything on him without lying in wait, ²³ or used a stone, by which a man may die, and without seeing him cast it upon him, so that he died, though he was not his enemy, and did not seek his harm;