Dalil
العربية

Quran As-Saffat 37:19

فَإِنَّمَا هِيَ زَجۡرَةٞ وَٰحِدَةٞ فَإِذَا هُمۡ يَنظُرُونَ

Translation

It will be only one shout, and at once they will be observing.