Rashi on Deuteronomy 18:14/רש"י על דברים י״ח:י״ד

1לא כן נתן לך ה' אלהיך BUT NOT SO HATH THE LORD THY GOD SUFFERED THEE [TO DO] — i.e. to hearken unto מעוננים and קוסמים, for you see, He has made His Divine Presence dwell upon the prophets and upon the “Urim and Thummim” (and these will, if necessary, inform thee of what God has in store for thee).