Hadith 3731
Mishkat al-Masabih
The Offices of Commander and Qadi · How to Conduct the Office of Qadi, and Fear of it - Section 1
Arabic
عَنْ أَبِي بَكْرَةَ قَالَ سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «لَا يَقْضِيَنَّ حَكَمٌ بَيْنَ اثْنَيْنِ وَهُوَ غَضْبَانُ»
English translation
Abu Bakra told that he heard God’s Messenger say, “No judge must give judgment between two people when he is angry.” (Bukhari and Muslim.)