1 Samuel 30:17

Twilight — The word signifies both the morning and evening twilight. But the latter seems here intended, partly because their eating, and drinking, and dancing, was more proper work for the evening, than the morning; and partly, because the evening was more convenient for David, that the fewness of his forces might not be discovered by the day — light. It is probable, that when he came near them, he reposed himself, and his army, in some secret place, whereof there were many parts, for a convenient season; and then marched on so as to come to them at the evening time.