Do not become angry

On the authority of Abu Hurayra (may Allah be pleased with him), that a man said to the Prophet (may Allah bless him and grant him peace): “Counsel me.” He said: "Do not become angry.” The man repeated his request several times, and each time the Prophet (may Allah bless him and grant him peace) answered: “Do not become angry."

Related by al-Bukhari.

[al-Bukhari 6116]