Surah Al-Kahf 18:83

وَيَسْـَٔلُونَكَ عَن ذِى ٱلْقَرْنَيْنِ ۖ قُلْ سَأَتْلُوا۟ عَلَيْكُم مِّنْهُ ذِكْرًا

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

Translation: Saheeh International

Tafsir

And they the Jews question you concerning Dhū’l-Qarnayn whose name was Alexander; he was not a prophet. Say ‘I shall recite relate to you a mention an account of him’ of his affair.

Excerpt from Tafsir al-Jalalayn, commentary on 18:83, via Quran.com. The reader has the full commentary and 9 more tafsirs.