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