Numbers 35:27
and the avenger of blood find him outside the limits of his city of refuge, and the avenger of blood kill the manslayer, there shall be no blood-guiltiness upon him;
Exodus 22:2
If the thief be encountered breaking in, and be smitten so that he die, there shall be no blood-guiltiness for him.
Deuteronomy 19:6
lest the avenger of blood pursue the manslayer, while his heart is hot, and overtake him, because the way is long, and smite him mortally; whereas he was not worthy of death, since he hated him not previously.
Deuteronomy 19:10
that innocent blood be not shed in the midst of thy land which Jehovah thy God giveth thee for an inheritance, and blood come not upon thee.