أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ عَبْدِ الْمَلِكِ بْنِ عُمَيْرٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي بَكْرَةَ، قَالَ كَتَبَ أَبِي وَكَتَبْتُ لَهُ إِلَى عُبَيْدِ اللَّهِ بْنِ أَبِي بَكْرَةَ وَهُوَ قَاضِي سِجِسْتَانَ أَنْ لاَ، تَحْكُمَ بَيْنَ اثْنَيْنِ وَأَنْتَ غَضْبَانُ فَإِنِّي سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏"‏ لاَ يَحْكُمْ أَحَدٌ بَيْنَ اثْنَيْنِ وَهُوَ غَضْبَانُ ‏"‏ ‏.‏

It was narrated that 'Abdur-Rahman bin Abi Bakrah said: "My father wrote to 'Ubaidullah bin Abi Bakrah - who was the judge of Sijistan - saying: 'Do not pass judgment between two people when you are angry, for I heard the Messenger of Allah [SAW] say: No one should pass judgment between two people when he is angry.'" Translation Not Available

Book Ref: Sunan An Nisai Book 49 Hadith 5406
Web Ref:  Sunan An Nisai Vol 6 Book 49 Hadith 5408