Deuteronomy 19:11-13

¹¹“But if there is a man who hates his neighbor and lies in wait for him and rises up against him and strikes him so that he dies, and he flees to one of these cities, ¹²then the elders of his city shall send and take him from there and deliver him into the hand of the avenger of blood, that he may die. ¹³You shall not pity him, but you shall purge the blood of the innocent from Israel, that it may go well with you.