Sunan of Abu Dawood Book 25, Hadith 3582

حَدَّثَنَا عَمْرُو بْنُ عَوْنٍ، قَالَ أَخْبَرَنَا شَرِيكٌ، عَنْ سِمَاكٍ، عَنْ حَنَشٍ، عَنْ عَلِيٍّ، عَلَيْهِ السَّلاَمُ قَالَ بَعَثَنِي رَسُولُ اللَّهِ صلى الله عليه وسلم إِلَى الْيَمَنِ قَاضِيًا فَقُلْتُ يَا رَسُولَ اللَّهِ تُرْسِلُنِي وَأَنَا حَدِيثُ السِّنِّ وَلاَ عِلْمَ لِي بِالْقَضَاءِ فَقَالَ ‏ "‏ إِنَّ اللَّهَ سَيَهْدِي قَلْبَكَ وَيُثَبِّتُ لِسَانَكَ فَإِذَا جَلَسَ بَيْنَ يَدَيْكَ الْخَصْمَانِ فَلاَ تَقْضِيَنَّ حَتَّى تَسْمَعَ مِنَ الآخَرِ كَمَا سَمِعْتَ مِنَ الأَوَّلِ فَإِنَّهُ أَحْرَى أَنْ يَتَبَيَّنَ لَكَ الْقَضَاءُ ‏"‏ ‏.‏ قَالَ فَمَا زِلْتُ قَاضِيًا أَوْ مَا شَكَكْتُ فِي قَضَاءٍ بَعْدُ ‏.‏

Narrated Ali ibn AbuTalib: The Messenger of Allah (ﷺ) sent me to the Yemen as judge, and I asked: Messenger of Allah, are you sending me when I am young and have no knowledge of the duties of a judge? He replied: Allah will guide your heart and keep your tongue true. When two litigants sit in front of you, do not decide till you hear what the other has to say as you heard what the first had to say; for it is best that you should have a clear idea of the best decision. He said: I had been a judge (for long); or he said (the narrator is doubtful): I have no doubts about a decision afterwards