"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.