Quran 38:65 from Surah Saad on Divine Marvels.
قُلۡ إِنَّمَآ أَنَا۠ مُنذِرٞۖ وَمَا مِنۡ إِلَٰهٍ إِلَّا ٱللَّهُ ٱلۡوَٰحِدُ ٱلۡقَهَّارُ
English translation: Say Only I am a warner and not (is there) any god except Allah the One the Irresistible
Transliteration: qul innama ana mundhirun wama min ilahin illa al-lahu al-wahidu al-qaharu