قُلْ فَأْتُوا بِكِتَابٍ مِنْ عِنْدِ اللَّهِ هُوَ أَهْدَى مِنْهُمَا أَتَّبِعْهُ إِنْ كُنْتُمْ صَادِقِينَ 49 فَإِنْ لَمْ يَسْتَجِيبُوا لَكَ فَاعْلَمْ أَنَّمَا يَتَّبِعُونَ أَهْوَاءَهُمْ وَمَنْ أَضَلُّ مِمَّنِ اتَّبَعَ هَوَاهُ بِغَيْرِ هُدًى مِنَ اللَّهِ إِنَّ اللَّهَ لَا يَهْدِي الْقَوْمَ الظَّالِمِينَ 50

Say, "Then bring a scripture from Allah which is more guiding than either of them that I may follow it, if you should be truthful." But if they do not respond to you – then know that they only follow their [own] desires. And who is more astray than one who follows his desire without guidance from Allah? Indeed, Allah does not guide the wrongdoing people.