When they had come to the land of Zuph, Saul said to his servant who was with him, Come, and let us return, lest my father leave off caring for the donkeys, and be anxious for us.
Some writers have marveled that Saul's servant knew that a `man of God' was available in that city, whereas Saul seemed to be totally ignorant of it.  This is easily explained.  Saul and his servant were searching for lost animals, and there is no way that they would have remained side by side walking together in such a search.  They would have separated in order to cover more area in their search.