An-Naazi'aat • EN-TAFSIR-IBN-ABBAS
﴿ يَوْمَ تَرْجُفُ ٱلرَّاجِفَةُ ﴾
“[HENCE, think of] the Day when a violent convulsion will convulse [the world],”
So Allah said: (On the day when the first trump resoundeth) this refers to the first blowing of the trumpet when everything will quake.