Sahih Muslim , Book 30, Hadith 21 (In-Book) ⓘ

Abd al-Rahman b. Abu Bakra reported: My father dictated (and I wrote for him) to Ubaidullah b. Abu Bakra while he was the judge of Sijistan: Do not judge between two persons when you are angry, for I have heard Allah's Messenger as saying: None of you should judge between two persons when he is angry.

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، 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 قَاضٍ بِسِجِسْتَانَ أَنْ لاَ، تَحْكُمَ بَيْنَ اثْنَيْنِ وَأَنْتَ غَضْبَانُ فَإِنِّي سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏ "‏ لاَ يَحْكُمْ أَحَدٌ بَيْنَ اثْنَيْنِ وَهُوَ غَضْبَانُ ‏" ‏ ‏.‏