Until when he reached the place where the sun set, he found it going down into a black sea, and found by it a people. We said: O Zulqarnain! either give them a chastisement or do them a benefit.

And when it is said to them: Follow what Allah has revealed, they say: Nay, we follow that on which we found our fathers. What! though the Shaitan calls them to the chastisement of the burning fire!