Riyad as-Salihin 638
Abu Hurairah (May Allah be pleased with him) reported:
A man asked the Prophet (ﷺ) to give him advice, and he (ﷺ) said, "Do not get angry." The man repeated that several times and he (ﷺ) replied (every time), "Do not get angry." [Al- Bukhari] .
وعن أبى هريرة رضي الله عنه أن رجلاً قال للنبى صلى الله عليه وسلم‏:‏ أوصنى قال‏:‏ “لا تغضب” فردد مراراً، قال‏:‏ “لا تغضب”‏.‏ ‏(‏‏(‏رواه البخارى‏)‏‏)‏‏.‏