Wa tahsabuhum ayqaazanw wa hum ruqood; wa nuqallibuhum zaatal yameeni wa zaatash shimaali wa kalbuhum baasitun ziraa'ayhi bilwaseed; lawit tala'ta 'alaihim la wallaita minhum firaaranw wa lamuli'ta minhum rubaa (al-Kahf 18:18)
And you would think them awake, while they were asleep. And We turned them to the right and to the left, while their dog stretched his forelegs at the entrance. If you had looked at them, you would have turned from them in flight and been filled by them with terror. (Al-Kahf [18] : 18)