Al Kahf Ayah 18

وَتَحْسَبُهُمْ أَيْقَاظًا وَهُمْ رُقُودٌ‌ۚ وَنُقَلِّبُهُمْ ذَاتَ ٱلْيَمِينِ وَذَاتَ ٱلشِّمَالِ‌ۖ وَكَلْبُهُم بَـٰسِطٌ ذِرَاعَيْهِ بِٱلْوَصِيدِ‌ۚ لَوِ ٱطَّلَعْتَ عَلَيْهِمْ لَوَلَّيْتَ مِنْهُمْ فِرَارًا وَلَمُلِئْتَ مِنْهُمْ رُعْبًا ١٨ And you would have thought they were awake, though they were asleep. We turned them over, to the right and left, while their dog stretched his forelegs at the entrance. Had you looked at them, you would have certainly fled away from them, filled with horror.