Quran 2:163 from Surah Al-Baqara on Divine Marvels.
وَإِلَٰهُكُمۡ إِلَٰهٞ وَٰحِدٞۖ لَّآ إِلَٰهَ إِلَّا هُوَ ٱلرَّحۡمَٰنُ ٱلرَّحِيمُ
English translation: And your God (is) God one (only) (there is) no god except Him the Most Gracious the Most Merciful
Transliteration: wa-ilahukum ilahun wahidun la ilaha illa huwa al-rahmanu al-rahimu