And you would think them awake, while they were asleep. And We (18:18)

﴿وَتَحْسَبُهُمْ أَيْقَاظًا وَهُمْ رُقُودٌ ۚ وَنُقَلِّبُهُمْ ذَاتَ الْيَمِينِ وَذَاتَ الشِّمَالِ ۖ وَكَلْبُهُم بَاسِطٌ ذِرَاعَيْهِ بِالْوَصِيدِ ۚ لَوِ اطَّلَعْتَ عَلَيْهِمْ لَوَلَّيْتَ مِنْهُمْ فِرَارًا وَلَمُلِئْتَ مِنْهُمْ رُعْبًا﴾
[ الكهف: 18]

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.

You - O one who looks at them - will think they are awake, because their eyes are open, though in actual fact they are asleep.
I turn them over in their sleep, sometimes to the right and sometimes to the left, so that the earth does not consume their bodies.
Their dog that accompanied them stretches out its forelegs at the entrance of the cave.
If you had come across them and seen them, you would have turned and run away being afraid of them, and your soul would have been filled with fear of them.

And you would have thought them awake, while they were asleep. And We turned them on their right and on their left sides, and their dog stretching forth his two forelegs at the entrance [of the Cave or in the space near to the entrance of the Cave (as a guard at the gate)]. Had you looked at them, you would certainly have turned back from them in flight, and would certainly have been filled with awe of them.

phonetic Transliteration

Watahsabuhum ayqathan wahum ruqoodun wanuqallibuhum thata alyameeni wathata alshshimali wakalbuhum basitun thiraAAayhi bialwaseedi lawi ittalaAAta AAalayhim lawallayta minhum firaran walamulita minhum ruAAban

Abdullah Yusuf Ali - Translation

Thou wouldst have deemed them awake, whilst they were asleep, and We turned them on their right and on their left sides: their dog stretching forth his two fore-legs on the threshold: if thou hadst come up on to them, thou wouldst have certainly turned back from them in flight, and wouldst certainly have been filled with terror of them.

Safi-ur-Rahman al-Mubarakpuri

And you would have thought them awake, whereas they were asleep. And We turned them on their right and on their left sides, and their dog stretching forth his two forelegs at the Wasid. Had you happened upon them, you would certainly have turned back from them in flight, and would certainly have been filled with awe of them.

Page 295 English transliteration