Quran 21:108 from Surah Al-Anbiyaa on Divine Marvels.
قُلۡ إِنَّمَا يُوحَىٰٓ إِلَيَّ أَنَّمَآ إِلَٰهُكُمۡ إِلَٰهٞ وَٰحِدٞۖ فَهَلۡ أَنتُم مُّسۡلِمُونَ
English translation: Say Only it is revealed to me that your god (is) God One so will you submit (to Him)
Transliteration: qul innama yuha ilayya annama ilahukum ilahun wahidun fahal antum mus'limuna