1 Samuel 19:3

and I will go out and stand beside my father in the field where thou art, probably a place where Saul often talked over private matters with his son, and I will commune with my father of thee; and what I see, that I will tell thee; he would immediately make known to David just what he would find out from his father, and it was for this reason that he had David hide nearby, lest his going to some distant place after the conversation with his father awaken suspicion of an understanding with David.