Deuteronomy 19:12, 13
Deuteronomy 19:12 NIV
the killer shall be sent for by the town elders, be brought back from the city, and be handed over to the avenger of blood to die.
Deuteronomy 19:13 NIV
Show no pity. You must purge from Israel the guilt of shedding innocent blood, so that it may go well with you.