حَتَّىٰ إِذَا بَلَغَ مَطْلِعَ الشَّمْسِ وَجَدَهَا تَطْلُعُ عَلَىٰ قَوْمٍ لَّمْ نَجْعَل لَّهُم مِّن دُونِهَا سِتْرًا
Then he (Dhu’l-Qarnayn) followed another way until, when he reached the rising-place of the sun and found it rising on a people for whom We had provided no shelter against it. (Al-Kahf 18:89–90)
Dhu’l-Qarnayn went in the direction of east and reached a point where he found a people who had no houses to live in and were even unaware of covering the body, deprived of even the smallest signs of civilization.
The verse may also suggest the following: In his campaign towards the east, Dhu’l-Qarnayn reached such a place with neither a mountain or a hill nor even a tree to shade them from the heat of the sun. Because of this, when the sun rose every day, the people came face to face with the sun and its heat. Or they did not have clothes to be protected from the heat of the sun. They were almost naked, as people around the Equator and in hot deserts are today. They had neither natural covers, nor buildings, nor did they have clothes. They lived in primitive conditions.