﴿ وَمَا يَنظُرُ هَٰٓؤُلَآءِ إِلَّا صَيْحَةًۭ وَٰحِدَةًۭ مَّا لَهَا مِن فَوَاقٍۢ ﴾

“And they [who now deny the truth - they, too,] have but to wait for one single blast [of punishment to overtake them]: it shall not be delayed a whit.”

(These) i.e. your folk, in case they deny you (wait for but one Shout) which is not followed by a second: this is the blow of the Resurrection, (there will be no second thereto) there will be no respite or return.