Quran 74:50 from Surah Al-Muddaththir on Divine Marvels.
كَأَنَّهُمۡ حُمُرٞ مُّسۡتَنفِرَةٞ
English translation: As if they (were) donkeys frightened
Transliteration: ka-annahum humurun mus'tanfiratun