"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."  

لِي رَسُولُ اللَّهِ ﷺ إِذَا تَقَاضَى إِلَيْكَ رَجُلاَنِ فَلاَ تَقْضِ لِلأَوَّلِ حَتَّى تَسْمَعَ كَلاَمَ الآخَرِ فَسَوْفَ تَدْرِي كَيْفَ تَقْضِي قَالَ عَلِيٌّ فَمَا زِلْتُ قَاضِيًا بَعْدُ