أَم يَقولونَ افتَراهُ ۖ قُل فَأتوا بِعَشرِ سُوَرٍ مِثلِهِ مُفتَرَياتٍ وَادعوا مَنِ استَطَعتُم مِن دونِ اللَّهِ إِن كُنتُم صادِقينَ

Or do they say, “He made it up?” Say, “Then produce ten similar chapters, made up, and call upon whomsoever you can—excluding God—if you are truthful.”