﴿ 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?”

Please check ayah 20:135 for complete tafsir.