وَما كُنتَ تَتلو مِن قَبلِهِ مِن كِتابٍ وَلا تَخُطُّهُ بِيَمينِكَ ۖ إِذًا لَارتابَ المُبطِلونَ

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.