1 Samuel 26:14
And David cried to the people, and to Abner the son of Ner, saying, Answerest thou not, Abner? Then Abner answered and said, Who art thou that criest to the king? And David cried to the people, and to Abner the son of Ner, saying, Answerest thou not, Abner? Then Abner answered and said, Who art thou that criest to the king?
The chapter belongs to the time after Saul killed the Lord's priests, when Abiathar son of Ahimelech escaped and fled to David, and David told him to remain with him without fear because the one seeking David's life also sought his life, and with David he would be safe. The verse occurs after David spared Saul's life a second time, when David withdrew to a safe distance, stood on the top of a hill, and called out with a loud voice to the people and to Abner. In the verse David rebukes Abner as a valiant man without equal in Israel for failing to guard his lord the king when one of the people had come in to destroy him, declaring that failure to be wrong and deserving of death because they had not guarded their master, the anointed of the Lord.
David points to the removed spear and jar of water as proof of how unguarded the king had been. The rebuke leads Saul to recognize David's voice and to confess that he has sinned and acted very foolishly and wrongly, with a promise to do David no more harm. Despite Saul's confession and promise, David refuses to place himself again in Saul's power. Saul then blesses David that he will do great things and prevail, a kindness that momentarily astonishes and subdues Saul, yet leaves David with no hope that the king will long remain in that frame of mind.