Quran 23:52 from Surah Al-Muminoon on Divine Marvels.
وَإِنَّ هَٰذِهِۦٓ أُمَّتُكُمۡ أُمَّةٗ وَٰحِدَةٗ وَأَنَا۠ رَبُّكُمۡ فَٱتَّقُونِ
English translation: And indeed this your religion (is) religion one And I Am your Lord so fear Me
Transliteration: wa-inna hadhihi ummatukum ummatan wahidatan wa-ana rabbukum fa-ittaquni