Numbers 35:27
And the avenger of blood finds him outside the borders of the city of his refuge, and the avenger of blood kills the slayer; he shall not be guilty of blood:
Exodus 22:2
If a thief be found breaking in, and be smitten that he dies, there shall no blood be shed for him.
Deuteronomy 19:6
Lest the avenger of blood pursue the manslayer, while his anger is hot, and overtake him, because the way is long, and slay him; whereas he was not worthy of death, inasmuch as he hated the victim not in time past.
Deuteronomy 19:10
That innocent blood be not shed in your land, which the LORD your God gives you for an inheritance, and so blood be upon you.