1 Samuel 26:15-16

And David said to Abner, “Are you not a man? Who is like you in Israel? Why then have you not kept watch over your lord the king? For one of the people came in to destroy the king your lord. This thing that you have done is not good. As the LORD lives, you deserve to die, because you have not kept watch over your lord, the LORD’s anointed. And now see where the king’s spear is and the jar of water that was at his head.”