It was one of the precepts given to the sons of Noah that whoso sheddeth man’s blood by man shall his blood be shed , that is, by the avenger of blood, Gen. 9:6. Now here we have the law settled between blood and blood, between the blood of the murdered and the blood of the murderer, and effectual provision made, I. That the cities of refuge should be a protection to him that slew another casually...