But if they turn away - then We have not sent you, (42:48)

Almuntakhab Fi Tafsir Alquran Alkarim

And If they should turn a deaf ear, nonetheless, We did not send you O Muhammad to watch over their innocence and folly; you are only responsible for relating to them Our message. Yet if We should extend Our mercy to mankind and make them taste Our benediction, they rejoice beyond a common joy, and if a misfortune or a calamity befalls them in consequence of their wrongful or unclean hands, man looks for the how and the why and the wherefore and becomes sour and in bitterness he turns his worst side outwards

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

(42:48) (O Prophet), if they turn away from the Truth, know that We did not send you to them as their overseer. *74 Your task is only to convey (the Message). Indeed when We give man a taste of Our Mercy, he exults in it. But if any misfortune afflicts them on account of their deeds, man is utterly ungrateful. *75

But if they turn away - then We have not sent you, meaning

*74) That is, "You have not been made responsible that you must bring them to the right path anyhow, nor will you be held accountable as to why these people did not come to the right path."
*75) "Man" here implies the mean and shallow people who are the subject of the discourse here, who have got a measure of the worldly provisions and are exulting in this, and who do not pay any attention when they are admonished to come to the right path. But when they are visited by a disaster in consequence of their own misdeeds, they stmt cursing their fate, and forget alI those blessings which AIlah has blessed them with, and do not try to understand how far they themselves are to be blamed for the condition in which they are placed. Thus, neither does prosperity become conducive to their reformation nor can adversity teach them a lesson and bring them to the right path. A study of the context shows that this is, in fact, a satire on the attitude of the people who were the addressees of the above discourse, but they have not been addressed to tell them of their weakness directly, but the weakness of man has been mentioned in a general way and pointed out that what is the real cause of his sad plight. This gives an important point of the wisdom of preaching: the weaknesses of the addressee should not be made the target directly, but they should be mentioned in a general way so that he is not provoked, and if his conscience has still some life in it, he may try to understand his shortcoming with a cool mind.
 

But if they turn away - then We have not sent you, meaning in Urdu

اب اگر یہ لوگ منہ موڑتے ہیں تو اے نبیؐ، ہم نے تم کو ان پر نگہبان بنا کر تو نہیں بھیجا ہے تم پر تو صرف بات پہنچا دینے کی ذمہ داری ہے انسان کا حال یہ ہے کہ جب ہم اسے اپنی رحمت کا مزا چکھاتے ہیں تو اُس پر پھول جاتا ہے، اور اگر اس کے اپنے ہاتھوں کا کیا دھرا کسی مصیبت کی شکل میں اُس پر الٹ پڑتا ہے تو سخت ناشکرا بن جاتا ہے