4كَذَّبَت ثَمودُ وَعادٌ بِالقارِعَةِAli UnalThe (tribes) of Thamūd and ‘Ād denied the Sudden, Mighty Strike.1The Sure Reality (which will undoubtedly take place and make every truth perfectly clear) signifies the Day of the Resurrection and Judgment, with all the events that will take place during it. The Sudden, Mighty Strike implies the event of the Last Day or the destruction of the world.