Numbers 35:23-27

or had any deadly stone, and without looking he dropped it on him so that he died, while he was not his enemy nor was he seeking to harm him,

then the congregation shall judge between the one who fatally struck the victim and the blood avenger in accordance with these ordinances.

And the congregation shall save the one who committed manslaughter from the hand of the blood avenger, and the congregation shall return him to his city of refuge to which he fled; and he shall live in it until the death of the high priest who was anointed with the holy oil.

But if at any time he goes beyond the border of his city of refuge to which he flees,

and the blood avenger finds him outside the border of his city of refuge, and the blood avenger kills him, he will not be guilty of bloodshed,