Quran 77:48 from Surah Al-Mursalaat on Divine Marvels.
وَإِذَا قِيلَ لَهُمُ ٱرۡكَعُواْ لَا يَرۡكَعُونَ
English translation: And when it is said to them Bow not they bow
Transliteration: wa-idha qila lahumu ir'ka'u la yarka'una