From Sahih Bukhari (Hadith 7158):
Narrated `Abdur Rahman bin Abi Bakra: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
Reference: Bukhari 7158