Surah Al-Qasas, ayah 49

28:49

قُلۡ فَأۡتُواْ بِكِتَٰبٖ مِّنۡ عِندِ ٱللَّهِ هُوَ أَهۡدَىٰ مِنۡهُمَآ أَتَّبِعۡهُ إِن كُنتُمۡ صَٰدِقِينَ ٤٩

Qul fa tū bikitābim min 'indillāhi huwa ahdā minhumā attabi'hu in kuntum sādiqīn

Say, "Then bring a scripture from Allāh which is more guiding than either of them that I may follow it, if you should be truthful."