Sahih al-Bukhari 7181
Narrated Um Salama:
(the wife of the Prophet) Allah's Messenger (ﷺ) heard some people quarreling at the door of his dwelling, so 
he went out to them and said, "I am only a human being, and litigants with cases of dispute come to 
me, and someone of you may happen to be more eloquent (in presenting his case) than the other, 
whereby I may consider that he is truthful and pass a judgment in his favor. If ever I pass a judgment 
in favor of somebody whereby he takes a Muslim's right unjustly, then whatever he takes is nothing 
but a piece of Fire, and it is up to him to take or leave."
حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا إِبْرَاهِيمُ بْنُ سَعْدٍ، عَنْ صَالِحٍ، عَنِ ابْنِ شِهَابٍ، قَالَ أَخْبَرَنِي عُرْوَةُ بْنُ الزُّبَيْرِ، أَنَّ زَيْنَبَ ابْنَةَ أَبِي سَلَمَةَ، أَخْبَرَتْهُ أَنَّ أُمَّ سَلَمَةَ زَوْجَ النَّبِيِّ صلى الله عليه وسلم أَخْبَرَتْهَا عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم أَنَّهُ سَمِعَ خُصُومَةً بِبَابِ حُجْرَتِهِ فَخَرَجَ إِلَيْهِمْ فَقَالَ ‏
"‏ إِنَّمَا أَنَا بَشَرٌ، وَإِنَّهُ يَأْتِينِي الْخَصْمُ، فَلَعَلَّ بَعْضَكُمْ أَنْ يَكُونَ أَبْلَغَ مِنْ بَعْضٍ، فَأَحْسِبُ أَنَّهُ صَادِقٌ فَأَقْضِي لَهُ بِذَلِكَ، فَمَنْ قَضَيْتُ لَهُ بِحَقِّ مُسْلِمٍ، فَإِنَّمَا هِيَ قِطْعَةٌ مِنَ النَّارِ، فَلْيَأْخُذْهَا أَوْ لِيَتْرُكْهَا ‏"‏‏.‏