Quran 40:12 from Surah Ghafir on Divine Marvels.
ذَٰلِكُم بِأَنَّهُۥٓ إِذَا دُعِيَ ٱللَّهُ وَحۡدَهُۥ كَفَرۡتُمۡ وَإِن يُشۡرَكۡ بِهِۦ تُؤۡمِنُواْۚ فَٱلۡحُكۡمُ لِلَّهِ ٱلۡعَلِيِّ ٱلۡكَبِيرِ
English translation: That (is) because when Allah was invoked Allah was invoked Alone you disbelieved but if (others) were associated with Him you believed So the judgment (is) with Allah the Most High the Most Great
Transliteration: dhalikum bi-annahu idha du'iya al-lahu wahdahu kafartum wa-in yush'rak bihi tu'minu fal-huk'mu lillahi al-'aliyi al-kabiri