وَمَا كُنۡتَ تَـتۡلُوۡا مِنۡ قَبۡلِهٖ مِنۡ كِتٰبٍ وَّلَا تَخُطُّهٗ بِيَمِيۡنِكَ اِذًا لَّارۡتَابَ الۡمُبۡطِلُوۡنَ
And, (O Beloved,) you never recited any book before this, nor did you write it with your own hand in which case the disbelievers would certainly have doubted.