Sahih Muslim Book - 30, Hadith - 4475

وَحَدَّثَنِى حَرْمَلَةُ بْنُ يَحْيَى أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ أَخْبَرَنِى يُونُسُ عَنِ ابْنِ شِهَابٍ أَخْبَرَنِى عُرْوَةُ بْنُ الزُّبَيْرِ عَنْ زَيْنَبَ بِنْتِ أَبِى سَلَمَةَ عَنْ أُمِّ سَلَمَةَ زَوْجِ النَّبِىِّ -صلى الله عليه وسلم- أَنَّ رَسُولَ اللَّهِ -صلى الله عليه وسلم- سَمِعَ جَلَبَةَ خَصْمٍ بِبَابِ حُجْرَتِهِ فَخَرَجَ إِلَيْهِمْ فَقَالَ « إِنَّمَا أَنَا بَشَرٌ وَإِنَّهُ يَأْتِينِى الْخَصْمُ فَلَعَلَّ بَعْضَهُمْ أَنْ يَكُونَ أَبْلَغَ مِنْ بَعْضٍ فَأَحْسِبُ أَنَّهُ صَادِقٌ فَأَقْضِى لَهُ فَمَنْ قَضَيْتُ لَهُ بِحَقِّ مُسْلِمٍ فَإِنَّمَا هِىَ قِطْعَةٌ مِنَ النَّارِ فَلْيَحْمِلْهَا أَوْ يَذَرْهَا ».

It was narrated from Umm Salamah, the wife of the Messenger of Allah (s.a.w), that the Messenger of Allah (s.a.w) heard noise of a dispute by the door of his apartment. He went out to them and said: "I am only human. Disputants come to me and one of them may be more eloquent than the other, so I think that he is telling the truth and I rule in his favor. If I rule in a person's favor concerning the rights of another Muslim, it is no more than a piece of Fire, so let him burden himself with it or forsake it."