"Do they then wait for anything but the like of the days of those who passed away before them?" meaning: the events of Allah—Exalted is He—regarding the previous nations whom He destroyed when they denied their messengers.
"Say: Then wait; I am with you among those who wait." That is: what befell them will befall you. Allah—Exalted is He—has delayed the punishment of the latter disbelievers of this nation until the First Blast.
﴿فَهَلْ يَنْتَظِرُونَ إِلا مِثْلَ أَيَّامِ الَّذين خلوا من قبلهم﴾ يَعْنِي: وَقَائِعَ اللَّهِ ﷿ فِي الأُمَمِ السَّالِفَةِ الَّتِي أَهْلَكَهُمْ بِهَا حِينَ كَذَّبُوا رُسُلَهُمْ.
﴿قُلْ فَانْتَظِرُوا إِنِّي مَعَكُمْ مِنَ الْمُنْتَظِرِينَ﴾ أَيْ: سَيَنْزِلُ بِكُمْ مَا نَزَلَ بِهِمْ؛ أَخَرَّ اللَّهُ ﷿ عَذَابَ آخِرِ كُفَّارِ هَذِهِ الأُمَّةِ إِلَى (ل ١٤٣) النَّفْخَةِ الأُولَى