Jami` at-Tirmidhi 1331
جامع الترمذي#1331Hasanحَدَّثَنَا هَنَّادٌ، حَدَّثَنَا حُسَيْنٌ الْجُعْفِيُّ، عَنْ زَائِدَةَ، عَنْ سِمَاكِ بْنِ حَرْبٍ، عَنْ حَنَشٍ، عَنْ عَلِيٍّ، قَالَ قَالَ لِي رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا تَقَاضَى إِلَيْكَ رَجُلاَنِ فَلاَ تَقْضِ لِلأَوَّلِ حَتَّى تَسْمَعَ كَلاَمَ الآخَرِ فَسَوْفَ تَدْرِي كَيْفَ تَقْضِي " . قَالَ عَلِيٌّ فَمَا زِلْتُ قَاضِيًا بَعْدُ . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ .
Ali narrated:"The Messenger of Allah (ﷺ) said to me: 'When two men come to you seeking judgement, do not judge for the first until you have heard the statement of the other. Soon you will know how to judge.'" 'Ali said: "I did not err since then
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 15:11