وَعَنْ عَلِيٍّ رضى الله عنه
قَالَ: قَالَ رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ -«إِذَا تَقَاضَى إِلَيْكَ رَجُلَانِ، فَلَا تَقْضِ لِلْأَوَّلِ، حَتَّى تَسْمَعَ كَلَامَ اَلْآخَرِ، فَسَوْفَ تَدْرِي كَيْفَ تَقْضِي». قَالَ. عَلِيٌّ: فَمَا زِلْتُ قَاضِيًا بَعْدُ»
The Messenger of Allah (sallallahu alayhi wa sallam) said: “When two men bring a case before you, do not decide in favor of the first till you hear what the other has to say, then you will know how to judge.” Ali (radiyallahu anhu) said: “Since then, I have continued to judge (in accordance with that).”
Bulugh al-Maram 1584, Book 14, Judgments, Hadith 6. 1 min read