Surah Al-Kahf Ayahs #87 Translated in English

And they ask you, [O Muḥammad], about Dhul-Qarnayn. Say, "I will recite to you about him a report."

Indeed, We established him upon the earth, and We gave him from everything a way [i.e., means].

So he followed a way

Until, when he reached the setting of the sun [i.e., the west], he found it [as if] setting in a body of dark water, and he found near it a people. We [i.e., Allāh] said, "O Dhul-Qarnayn, either you punish [them] or else adopt among them [a way of] goodness."

He said, "As for one who wrongs, we will punish him. Then he will be returned to his Lord, and He will punish him with a terrible punishment [i.e., Hellfire].