Quran 38:70 from Surah Saad on Divine Marvels.
إِن يُوحَىٰٓ إِلَيَّ إِلَّآ أَنَّمَآ أَنَا۠ نَذِيرٞ مُّبِينٌ
English translation: Not has been revealed to me except that only I am a warner clear
Transliteration: in yuha ilayya illa annama ana nadhirun mubinun