﴿ وَقَالُوا۟ لَوْلَا يَأْتِينَا بِـَٔايَةٍۢ مِّن رَّبِّهِۦٓ ۚ أَوَلَمْ تَأْتِهِم بَيِّنَةُ مَا فِى ٱلصُّحُفِ ٱلْأُولَىٰ ﴾

“NOW THEY [who are blind to the truth] are wont to say, "If [Muhammad] would but produce for us a miracle from his Sustainer! [But] has there not come unto them a clear evidence [of the truth of this divine writ] in what is [to be found] in the earlier scriptures?”

(And they say) i.e. the people of Mecca: (If only he would bring us) why does not Muhammad bring us (a miracle) a sign (from his Lord! Hath there not come unto them the proof) the exposition (of what is in the former Scriptures) what is in the Torah and the Gospel for they contained the attributes and description of the Prophet Muhammad (pbuh)?