Surah Al-Mudaththir (The One Covered up), Verse 50

كَاَنَّهُمْ حُمُرٌ مُّسْتَنْفِرَةٌ ۟

Ka annahum humurum mustanfirah

“As if they were affrighted asses,”

Quran 74:50 (Yusuf Ali Translation)