حَتَّىٰ إِذَا بَلَغَ مَطْلِعَ الشَّمْسِ وَجَدَهَا تَطْلُعُ عَلَىٰ قَوْمٍ لَّمْ نَجْعَل لَّهُم مِّن دُونِهَا سِتْرًا ٩٠

Until he reached the boundary (of a locality in the direction) of the sunrise. There he perceived (the rising of) the sun (as if) it were rising on the people (living in that piece of land) for whom We had provided no cover (for protection) against the sun (i.e., they lived in the caves, without clothes and houses). (18:90)