Mishkat al-Masabih 18 The Offices of Commander and Qadi كتاب الإمارة والقضاء 80

وَعَنْ عَبْدُ اللَّهِ بْنِ أَبِي أَوْفَى قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِنَّ اللَّهَ مَعَ الْقَاضِي مَا لَمْ يَجُرْ فَإِذَا جَارَ تَخَلَّى عَنْهُ وَلَزِمَهُ الشَّيْطَانُ» . رَوَاهُ التِّرْمِذِيُّ وَابْنُ مَاجَهْ وَفِي رِوَايَةٍ: «فَإِذَا جارَ وَكله إِلَى نَفسه»

‘Abdallah b. Abu Aufa reported God’s Messenger as saying, “God is with the qadi as long as he is not tyrannical, but when he is He departs from him and the devil attaches himself to him.” A version has, “When he is tyrannical He leaves him to his own devices.” Tirmidhi and Ibn Majah transmitted it.