Hazrat Abu Bakrah (may Allah be pleased with him) wrote to his son (Ubaidullah), who was in Sijistan at the time, that do not judge between two people when you are angry, because I heard from the Noble Prophet (peace and blessings be upon him) that no arbitrator should judge between two people when he is angry.
Hadith Referenceاللؤلؤ والمرجان / كتاب الأقضية / 1119
Hadith Gradingمحدثین:«صحیح»
Hadith Takhrij«صحیح، أخرجه البخاري في: 93 كتاب الأحكام: 13 باب هل يقضي الحاكم أو يفتي وهو غضبان»