1 Samuel 26:15 in the King James Version
And David said to Abner, Art not thou a valiant man? and who is like to thee in Israel? wherefore then hast thou not kept thy lord the king? for there came one of the people in to destroy the king thy lord.
Context
14 and David cried to the people, and to Abner the son of Ner, saying, “Don’t you answer, Abner?” Then Abner answered, “Who are you who calls to the king?”
15 David said to Abner, “Aren’t you 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 your lord the king.
16 This thing isn’t good that you have done. As the LORD lives, you are worthy to die, because you have not kept watch over your lord, the LORD’s anointed. Now see where the king’s spear is, and the jar of water that was at his head.”