Holding Fast to the Qur'an and Sunnah
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا الزُّهْرِيُّ، عَنْ عُبَيْدِ اللَّهِ، عَنْ أَبِي هُرَيْرَةَ، وَزَيْدِ بْنِ خَالِدٍ، قَالاَ كُنَّا عِنْدَ النَّبِيِّ صلى الله عليه وسلم فَقَالَ " لأَقْضِيَنَّ بَيْنَكُمَا بِكِتَابِ اللَّهِ ".Narrated Abu Huraira and Zaid bin Khalid:We were with the Prophet (ﷺ) when he said (to two men), "I shall judge between you according to Allah's Book (Laws)
From Sahih al-Bukhari, whose reports the scholars accept as authentic.