Surah Al-A'raf 7:203

وَإِذَا لَمْ تَأْتِهِم بِـَٔايَةٍ قَالُوا۟ لَوْلَا ٱجْتَبَيْتَهَا ۚ قُلْ إِنَّمَآ أَتَّبِعُ مَا يُوحَىٰٓ إِلَىَّ مِن رَّبِّى ۚ هَـٰذَا بَصَآئِرُ مِن رَّبِّكُمْ وَهُدًى وَرَحْمَةٌ لِّقَوْمٍ يُؤْمِنُونَ

And when you, [O Muḥammad], do not bring them a sign [i.e., miracle], they say, "Why have you not contrived it?" Say, "I only follow what is revealed to me from my Lord. This [Qur’ān] is enlightenment from your Lord and guidance and mercy for a people who believe."

Translation: Saheeh International

Tafsir

And when you do not bring them that is the people of Mecca a sign from among those which they request they say ‘Why have you not chosen one?’ why have you not produced one all by yourself? Say to them ‘I follow only that which is revealed to me from my Lord and it is not for me to bring anything from myself; …

Excerpt from Tafsir al-Jalalayn, commentary on 7:203, via Quran.com. The reader has the full commentary and 9 more tafsirs.