Surah Yunus Verse 38 - English Translation by Ali Unal
Surah Yunusأَمۡ يَقُولُونَ ٱفۡتَرَىٰهُۖ قُلۡ فَأۡتُواْ بِسُورَةٖ مِّثۡلِهِۦ وَٱدۡعُواْ مَنِ ٱسۡتَطَعۡتُم مِّن دُونِ ٱللَّهِ إِن كُنتُمۡ صَٰدِقِينَ
Or do they say that he (the Messenger) has fabricated it? Say: "(If it is possible for a mortal to fabricate it) then produce a surah like it and call for help on anyone you can, apart from God, if you are truthful (in your doubt and the claim you base upon it)