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]. (TR)
Reference (TR): Bulugh al-Maram 1401 (TR)
In-book reference (TR): Book 14, Hadith 5 (TR)
English translation (TR): Book 14, Hadith 1401 (TR)