اَمۡ يَقُوۡلُوۡنَ افۡتَرٰىهُؕ قُلۡ فَاۡتُوۡا بِعَشۡرِ سُوَرٍ مِّثۡلِهٖ مُفۡتَرَيٰتٍ وَّادۡعُوۡا مَنِ اسۡتَطَعۡتُمۡ مِّنۡ دُوۡنِ اللّٰهِ اِنۡ كُنۡتُمۡ صٰدِقِيۡنَ

Or do they say, "He invented it"? Say, "Then bring ten surahs like it that have been invented and call upon [for assistance] whomever you can besides Allah, if you should be truthful