2 Samuel 3:24-25

What hast thou done? David's secret dealing makes Joab see a personal wrong to himself in the negotiation with Abner. There could be no room, he feels, for both of them in David's army, and David meant, he supposes, to sacrifice himself. In hot haste, therefore, he rushes into the king's presence, and reproaches him for what he has done, but covers his personal feelings with professed zeal for his master's interests. Abner is a mere spy, who has come on a false pretext, and with the real intention of learning David's going out and coming in, that is, his present manner of life and undertakings. All that thou doest; literally, all that thou art doing; all that is now going on, and thy plans and purposes. Abner would not only judge by what he saw, but in his interview with David would lead him on to talk of his hopes and prospects. David had little time to explain the real object of Abner's coming, nor was Joab in a mood to listen to anything he said. He had detected his master in secret negotiations, and would regard his excuses as tainted with deceit. And after giving vent to his auger in reproaches, he hurried away to thwart David's plans by a deed of most base villainy. Had David acted openly, all would have been done with Joab's consent and approval.