1 Samuel 18:8-9

What can he have more? etc. Literally, "And there is beside for him only the kingdom. Though many years had passed since Samuel pronounced Saul's deposition, and the choice of another in his place ( 1 Samuel 15:28 ), yet it was not a thing that a king could ever forget. No doubt he had often looked out for signs of the person destined to be his successor; and now, when he had stood powerless before the enemy, a shepherd boy had stepped forth and given him the victory. And this stripling, taken to be his companion in arms, had shown so great qualities that the people reckoned him at ten times Saul's worth. Had Saul been the high-minded man he was when appointed to the kingdom ( 1 Samuel 11:13 ), he would have thrust such thoughts from him. But his mind had become cankered with discontent and brooding thoughts, and so he eyed David from that day and forward. In many nations the eye of an envious man is supposed to have great power of injury. Here it means that Saul cast furtive glances at David full of malice and ill will.