Deuteronomy 19:11-13

BSB(i) 11 If, however, a man hates his neighbor and lies in wait, attacks him and kills him, and then flees to one of these cities, 12 the elders of his city must send for him, bring him back, and hand him over to the avenger of blood to die. 13 You must show him no pity. You are to purge from Israel the guilt of shedding innocent blood, that it may go well with you.