Surat Al Kahf (17-18)

{وَتَرَى الشَّمْسَ إِذَا طَلَعَت تَّزَاوَرُ عَن كَهْفِهِمْ ذَاتَ الْيَمِينِ وَإِذَا غَرَبَت تَّقْرِضُهُمْ ذَاتَ الشِّمَالِ وَهُمْ فِي فَجْوَةٍ مِّنْهُ ذَلِكَ مِنْ آيَاتِ اللَّهِ مَن يَهْدِ اللَّهُ فَهُوَ الْمُهْتَدِ وَمَن يُضْلِلْ فَلَن تَجِدَ لَهُ وَلِيّاً مُّرْشِداً} (الكهف: 17)

17- When the sun rises, it enters their cave while inclining to the right, and the door will be toward north. And when it sets, it leaves them to the left side, coming from the north door. This is the wisdom of Allah and good management, for the sun is necessary for man, and so that their bodies would be sound and healthy otherwise continuous moisture would corrupt them.

This is the guidance of Allah to those believing youth when He guided them to that suitable cave. Indeed, whom Allah guides no one can mislead and whom leads astray will not find someone to guide him or rescue him of error.

{وَتَحْسَبُهُمْ أَيْقَاظاً وَهُمْ رُقُودٌ وَنُقَلِّبُهُمْ ذَاتَ الْيَمِينِ وَذَاتَ الشِّمَالِ وَكَلْبُهُم بَاسِطٌ ذِرَاعَيْهِ بِالْوَصِيدِ لَوِ اطَّلَعْتَ عَلَيْهِمْ لَوَلَّيْتَ مِنْهُمْ فِرَاراً وَلَمُلِئْتَ مِنْهُمْ رُعْباً} (الكهف: 18)

18- If you had seen them, you would have believed they are awake while they are asleep. We turn them to the right and to the left so as not to corrupt their bodies due to long stay, and their dog was stretching his forearms to the door. If you had seen them in that condition, you would have become frightened.