Deuteronomy 19
11 Ref But if any man has hate for his neighbour, and waiting for him secretly makes an attack on him and gives him a blow causing his death, and then goes in flight to one of these towns;
12 Ref The responsible men of his town are to send and take him, and give him up to the one who has the right of punishment to be put to death.
13 Ref Have no pity on him, so that Israel may be clear from the crime of putting a man to death without cause, and it will be well for you.