قُلْ فَأْتُوا۟ بِكِتَٰبٍ مِّنْ عِندِ ٱللَّهِ هُوَ أَهْدَىٰ مِنْهُمَآ أَتَّبِعْهُ إِن كُنتُمْ صَٰدِقِينَ

Say: Then bring some (other) book from Allah which is a better guide than both of them, (that) I may follow it, if you are truthful.