Quran 21:92 from Surah Al-Anbiyaa on Divine Marvels.
إِنَّ هَٰذِهِۦٓ أُمَّتُكُمۡ أُمَّةٗ وَٰحِدَةٗ وَأَنَا۠ رَبُّكُمۡ فَٱعۡبُدُونِ
English translation: Indeed this (is) your religion religion one and I Am your Lord so worship Me
Transliteration: inna hadhihi ummatukum ummatan wahidatan wa-ana rabbukum fa-u'buduni