1 Samuel 18:13

From him; from his presence and court; which he did, partly, because he feared lest David should watch and find an opportunity to kill him, as he had designed to kill David; partly, because he was a great eyesore, and his presence now made him more sad than ever his music had made him cheerful; and principally, that hereby he might expose him to the greatest hazards, and in some sort betray him into the hands of the Philistines. He went out and came in; he led his soldiers forth to battle, and brought them back again with safety. Compare 2 Samuel 5:2. Or else the phrase of coming in and going out may be understood (as elsewhere) for conversing; or (as we use to say) going to and fro about business, as 1 Samuel 29:6.