اَمۡ يَقُوۡلُوۡنَ افۡتَرٰٮهُ ؕ قُلۡ فَاۡتُوۡا بِسُوۡرَةٍ مِّثۡلِهٖ وَادۡعُوۡا مَنِ اسۡتَطَعۡتُمۡ مِّنۡ دُوۡنِ اللّٰهِ اِنۡ كُنۡتُمۡ صٰدِقِيۡنَ
Do they say: ‘The Messenger has fabricated it himself’? Say: ‘Then bring forth any (one) Sura like it, and call on (for your help) all you can besides Allah, if you are truthful.’