Quran 42:51 from Surah Ash-Shura on Divine Marvels.
۞وَمَا كَانَ لِبَشَرٍ أَن يُكَلِّمَهُ ٱللَّهُ إِلَّا وَحۡيًا أَوۡ مِن وَرَآيِٕ حِجَابٍ أَوۡ يُرۡسِلَ رَسُولٗا فَيُوحِيَ بِإِذۡنِهِۦ مَا يَشَآءُۚ إِنَّهُۥ عَلِيٌّ حَكِيمٞ
English translation: And not is for any human that Allah should speak to him Allah should speak to him except (by) revelation or from behind a veil or (by) sending a Messenger then he reveals by His permission what He wills Indeed, He (is) Most High Most Wise
Transliteration: wama kana libasharin an yukallimahu al-lahu illa wahyan aw min warai hijabin aw yur'sila rasulan fayuhiya bi-idh'nihi ma yashau innahu aliyyun hakimun