judicial authority of Qur'an

أَلَمْ تَرَ إِلَى ٱلَّذِينَ أُوتُوا۟ نَصِيبًا مِّنَ ٱلْكِتَـٰبِ يُدْعَوْنَ إِلَىٰ كِتَـٰبِ ٱللَّهِ لِيَحْكُمَ بَيْنَهُمْ ثُمَّ يَتَوَلَّىٰ فَرِيقٌ مِّنْهُمْ وَهُم مُّعْرِضُونَ

Do you not consider, [O Muḥammad], those who were given a portion of the Scripture? They are invited to the Scripture of Allāh that it should arbitrate between them; then a party of them turns away, and they are refusing.