Numbers 35:27
and if the avenger of blood finds him outside the borders of the city of his refuge, and if the avenger of blood kills the slayer, he shall not be guilty of blood,
Exodus 22:2
If a thief is found breaking in, and is struck so that he dies, no blood shall be shed for him.
Deuteronomy 19:6
so that the avenger of the blood may not pursue the slayer while his heart is hot, and overtake him because the way is long, and kill him, and he had no sentence worthy of death, for he did not hate him in time past.
Deuteronomy 19:10
so that innocent blood may not be shed in your land which Jehovah your God gives you for an inheritance, and blood may not be on you.