Yunus Ayah 38

أَمْ يَقُولُونَ ٱفْتَرَٮٰهُ‌ۖ قُلْ فَأْتُواْ بِسُورَةٍ مِّثْلِهِۦ وَٱدْعُواْ مَنِ ٱسْتَطَعْتُم مِّن دُونِ ٱللَّهِ إِن كُنتُمْ صَـٰدِقِينَ ٣٨ Or do they claim, “He made it up!”? Tell them ?O Prophet?, “Produce one sûrah like it then, and seek help from whoever you can—other than Allah—if what you say is true!”