العنكبوت — Al-'Ankabut Ayat 48
وَمَا كُنْتَ تَتْلُوْا مِنْ قَبْلِهٖ مِنْ كِتٰبٍ وَّلَا تَخُطُّهٗ بِيَمِيْنِكَ اِذًا لَّارْتَابَ الْمُبْطِلُوْنَ
Wa mā kunta tatlū min qablihī min kitābiw wa lā takhuṭṭuhū biyamīnika iżal lartābal-mubṭilūn(a).
"And you did not recite before it any scripture, nor did you inscribe one with your right hand. Otherwise the falsifiers would have had [cause for] doubt."