Quran 29:48 from Surah Al-Ankaboot on Divine Marvels.
وَمَا كُنتَ تَتۡلُواْ مِن قَبۡلِهِۦ مِن كِتَٰبٖ وَلَا تَخُطُّهُۥ بِيَمِينِكَۖ إِذٗا لَّٱرۡتَابَ ٱلۡمُبۡطِلُونَ
English translation: And not (did) you recite before it before it any Book and not (did) you write it with your right hand in that case surely (would) have doubted the falsifiers
Transliteration: wama kunta tatlu min qablihi min kitabin wala takhuttuhu biyaminika idhan la-ir'taba al-mub'tiluna