The Forty Hadiths of al-Nawawi
On the authority of Abu Hurayrah, may Allah be pleased with him,
that a man said to the Prophet, peace and blessings of Allah be upon him,
"Advise me."
He replied, "Do not become angry."
The man repeated his request several times,
and he replied, "Do not become angry."
It was recorded by al-Bukhari.
This hadith highlights the greatness of the virtue of forbearance and self-restraint,
and that anger is the root of many evils and sins.
Through anger, a person falls into injustice, severing ties, and regret.
It is for this reason that the Prophet, peace be upon him, advised
avoiding the causes of anger,
and struggling against one's self when it occurs,
not by suppressing the feeling itself,
but by restraining its effects and acting with wisdom.