Narrated Abu Bakrah (RA):
I heard Allah's Messenger (ﷺ) say, "No judge should give judgement between two people while he is angry."[Agreed upon]. (ID)
Reference (ID): Bulugh al-Maram 1401 (ID)
In-book reference (ID): Book 14, Hadith 5 (ID)
English translation (ID): Book 14, Hadith 1401 (ID)