And when you, [O Muhammad], do not bring them a sign, they (7:203)

Almuntakhab Fi Tafsir Alquran Alkarim

And if you do not present them with a supernatural act to satisfy their desire, they wish you would go in quest of it. Say to them: I only follow what is revealed to me by spiritual influence from Allah, my Creator; this is the Quran, the true illumination and enlightenment. It is revealed by Allah, your Creator, to open your minds eyes and guide those whose hearts have been touched with the divine hand into all truth and to confer on them Allahs mercy and blessings

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

(7:203) [O Prophet!] When you do not produce before them any miracle, they say: 'Why do you not choose for yourself a miracle?' *151 Say to them: 'I follow only what is revealed to me by my Lord. This is nothing but a means of insight into the truth, and guidance and mercy from your Lord to the people who believe. *152

And when you, [O Muhammad], do not bring them a sign, they meaning

*151). This question is a taunt rather than a simple query. What the utterance implies is that if the claim to prophethood is genuine, it should have been supported by some miracle. The next verse contains a fitting rejoinder to the taunt.
*152). The Prophet (peace be on him) is being made to tell his opponents in clear terms that he has no power to get whatever he wants. Being God's Messenger, he is required to follow the directives of the One Who has sent him and has granted him the Qur'an which has the light of guidance. The major characteristic of this Book is that those who seek guidance from it do indeed find the right way. The moral excellence visible in the lives of those people who accept the Qur'an is testimony to the fact that they have been blessed with God's mercy.
 

And when you, [O Muhammad], do not bring them a sign, they meaning in Urdu

اے نبیؐ، جب تم اِن لوگوں کے سامنے کوئی نشانی (یعنی معجزہ) پیش نہیں کرتے تو یہ کہتے ہیں کہ تم نے اپنے لیے کوئی نشانی کیوں نہ انتخاب کر لی؟ ان سے کہو "میں تو صرف اُس وحی کی پیروی کرتا ہوں جو میرے رب نے میری طرف بھیجی ہے یہ بصیرت کی روشنیاں ہیں تمہارے رب کی طرف سے اور ہدایت اور رحمت ہے اُن لوگوں کے لیے جو اِسے قبول کریں