Deuteronomy 19:11-13

Leeser(i) 11 But if any man be an enemy to his neighbor, and he lie in wait for him, and rise up against him, and smite him mortally so that he die, and he flee unto one of these cities: 12 Then shall the elders of his city send and fetch him thence, and they shall deliver him into the hand of the avenger of the blood, that he may die. 13 Thy eye shall not look with pity on him; but thou shalt put away the shedding of innocent blood from Israel, that it may go well with thee.