1 Samuel 26:15-16

So David said to Abner, “Are you not a man? And who is like you in Israel? Why then have you not guarded your lord the king? For one of the people came to destroy the king your lord. This thing that you have done is not good. As the LORD lives, all of you must surely die, because you did not guard your lord, the LORD’S anointed. And now, see where the king’s spear is and the jug of water that was at his head.”