And We did not destroy any city but that for it was (15:4)

Almuntakhab Fi Tafsir Alquran Alkarim

We never destroyed a city, a people or a nation arbitrarily but according to a justified act. There and then their end is being predetermined and unalterably decreed

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(15:4) We had prescribed a respite for every habitation that we destroyed before this. *2

And We did not destroy any city but that for it was meaning

*2) This is to refute the fallacious argument of the disblievers that Muhammad (Allah's peace be upon him) was not a true Prophet because they had received no prompt punishment for their disbelief. It is like this: "We have never seized a community at the first commital of kufr.
We prescribe a limit for every community to hear and understand the message and reform its ways. Then We tolerate its mischief and evil deeds up to that limit and allow it full freedom to do as it likes, and give it respite till the term expires. That is why We are tolerating their attitude of ridicule and denial. (For the full meaning of respite, please refer to E.N. 18 of Surah Ibrehim).
 

And We did not destroy any city but that for it was meaning in Urdu

ہم نے اِس سے پہلے جس بستی کو بھی ہلاک کیا ہے اس کے لیے ایک خاص مہلت عمل لکھی جاچکی تھی