وَمَا كُنتَ تَتْلُوا مِن قَبْلِهِۦ مِن كِتَـٰبٍ وَلَا تَخُطُّهُۥ بِيَمِينِكَ ۖ إِذًا لَّٱرْتَابَ ٱلْمُبْطِلُونَ

Wama kunta tatloo min qablihi min kitabinwala takhuttuhu biyameenika ithan lartabaalmubtiloon

And you did not recite before it any scripture, nor did you inscribe one with your right hand. Then [i.e., otherwise] the falsifiers would have had [cause for] doubt.