The Holy Quran 18:90 — Surah Al-Kahf

Arabic text

حَتَّىٰٓ إِذَا بَلَغَ مَطْلِعَ ٱلشَّمْسِ وَجَدَهَا تَطْلُعُ عَلَىٰ قَوْمٍ لَّمْ نَجْعَل لَّهُم مِّن دُونِهَا سِتْرًا

Translation

...until he reached the place where the sun rose (in a far easterly direction), he found it rising over a nation to whom We had not given any shelter against it. (They lived as animals do - without building homes and probably without clothing as well.) (Although the Qur'aan makes no further mention of his encounter with these people, Dhul Qarnayn also invited them to Towheed as he had done with the people in the west.)

Tafsir (excerpt) — Tafsir Usmani

A wild people in the east: that is, in the farthest east he saw a people whom the rays of the sun reached unhindered. These people were probably wild forest-dwellers; building houses and putting up roofs was probably not a custom among them, just as even now it is not the practice among many wild nomadic peoples.

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