Surah Al-Ankaboot Verse 48 - English Translation by Mohammad Shafi
Surah Al-Ankabootوَمَا كُنتَ تَتۡلُواْ مِن قَبۡلِهِۦ مِن كِتَٰبٖ وَلَا تَخُطُّهُۥ بِيَمِينِكَۖ إِذٗا لَّٱرۡتَابَ ٱلۡمُبۡطِلُونَ
And you (Prophet Muhammad) have not read any book before it (Qur'aan), nor have you written anything in your own hand. Had you been so literate, the followers of falsehood might have some reason to doubt (the divine authorship of the Qur'aan)