Warning concerning the Greatness of the Day of Judgement

Al-Haqqah is one of the names of the Day of Judgment, because during it the promise and the threat will inevitably occur. Due to this, Allah has declared the greatness of this matter. So He says,

﴿ وَمَآ أَدۡرَٮٰكَ مَا ٱلۡحَآقَّةُ ﴾

(And what will make you know what Al-Haqqah is)