Hadith #6889 (Sahih al-Bukhari)
Book: Judgments (Ahkaam)
Narrator(s): Abdur Rahman bin Abi Bakra عبد الرحمن بن أبي بكرة
Grade: Sahih

Abu Bakra wrote to his son who was in Sijistan: ‘Do not judge between two persons when you are angry, for I heard the Prophet (ﷺ) saying, “A judge should not judge between two persons while he is in an angry mood.”

Source: https://parallelquran.com/hadith/sahih-al-bukhari-6889/