قُل فَأتوا بِكِتابٍ مِن عِندِ اللَّهِ هُوَ أَهدىٰ مِنهُما أَتَّبِعهُ إِن كُنتُم صادِقينَ

Say, “Then produce a scripture from God that offers superior guidance than these two, and I will follow it, if you are truthful.”