2 Samuel 1:16

Head. None but thyself can be answerable for thy death. See Matthew xxvii. 25. David was already supreme magistrate, and he wished that all should be convinced that he rejoiced not at the death of the king, and that none might imitate the example of this wretch. (Calmet) --- Thus Vitellius punished the murderers of Galba, "not out of respect to Galba; but, according to the custom of princes, as a protection for the present, and a threat of vengeance for the future," in case any should dare to treat him in like manner. (Tacitus i.) Tradito principibus more, munimentum in præsens, in posterum ultionem.