And if not that a disaster should strike them for what their (28:47)

Almuntakhab Fi Tafsir Alquran Alkarim

Had We not sent you O Muhammad to the people in general and to the Pagans in particular to serve as a spectacle and a warning they would have said when befallen with a misfortune as a reaction to what their wrongful and unclean hands have committed: O Allah, our Creator, if only You had sent to us a Messenger to guide us to Your path in which Your divine signs shine like beacons inciting us to lift to You our inward sight

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

(28:47) (This We have done) lest, when a calamity befalls them in consequence of their own misdeeds, 'they should say, "Our Lord, had You sent a messenger to us, we would have obeyed Your Revelations and been among the believers. " *66

And if not that a disaster should strike them for what their meaning

*66) This very thing has been presented at several places in the Qur'an as the reason for sending the Messengers, but it will not be correct to conclude from this that a Messenger should be sent on every occasion at every place for this purpose. AS long as the message of a Prophet remains intact in the world and the means of conveying it to others exist, there is no need for a new Prophet, unless need arises to supplement the previous message, or to supplant it by a new message, Nevertheless, when the teachings of the Prophets are forgotten, or become mixed up with errors and deviations and can no longer be relied upon as means of guidance, then the people do get a chance to make the excuse that there existed no arrangement whatever to make them aware of the distinction between the Truth and the untruth and guide them to the right way: so they could not be guided aright. To meet such an excuse Allah sends the Prophets in such conditions so that any one who follows a wrong way after that may himself be held responsible for his going astray.
 

And if not that a disaster should strike them for what their meaning in Urdu

(اور یہ ہم نے اس لیے کیا کہ) کہیں ایسا نہ ہو کہ اُن کے اپنے کیے کرتوتوں کی بدولت کوئی مصیبت جب اُن پر آئے تو وہ کہیں "اے پروردگار، تُو نے کیوں نہ ہماری طرف کوئی رسول بھیجا کہ ہم تیری آیات کی پیروی کرتے اور اہلِ ایمان میں سے ہوتے"