"Abu Bakrah wrote to me, saying: 'I heard the Messenger of Allah [SAW] say: No one should pass two judgments on one issue, and no one should pass judgment between two disputing parties while he is angry.'" (Using translation from Nasāʾī 5421)  

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «لَا يَقْضِيَنَّ أَحَدٌ فِي قَضَاءٍ بِقَضَاءَيْنِ وَلَا يَقْضِي أَحَدٌ بَيْنَ خَصْمَيْنِ وَهُوَ غَضْبَانُ»