قُلْ فَأْتُوا بِكِتَابٍ مِّنْ عِندِ اللَّهِ هُوَ أَهْدَى مِنْهُمَا أَتَّبِعْهُ إِن كُنتُمْ صَادِقِينَ

Say, ‘If you are truthful, bring some Book from Allah better in guidance than the two on them so that I may follow it.’