Surah Al-Haqqah 69:3

وَمَآ أَدْرَىٰكَ مَا ٱلْحَآقَّةُ

And what can make you know what is the Inevitable Reality?

Translation: Saheeh International

Tafsir

And how would you know what the Reality is? repeated as an extra emphasis of its enormity; the first mā of the previous verse is the subject the second one its predicate; the second mā and its predicate also function as the second direct object of the verb ‘knowing’.

Excerpt from Tafsir al-Jalalayn, commentary on 69:3, via Quran.com. The reader has the full commentary and 9 more tafsirs.