Dr. Mustafa Khattab, the Clear Quran - Surah As-Saffat, ayah 19

Translation of Surah As-Saffat, ayah 19 (37:19)

فَإِنَّمَا هِيَ زَجۡرَةٞ وَٰحِدَةٞ فَإِذَا هُمۡ يَنظُرُونَ ١٩
It will only take one Blast,1 then at once they will see ˹it all˺.

Foot notes

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This is when the Trumpet will be blown the second time.