Sunnah.com reference : Book 16, Hadith 56English translation : Book 16, Hadith 1535Arabic reference : Book 16, Hadith 1492
Abu Hurairah (RAA) narrated, ‘A man said, “O Messenger of Allah, advise me.” The Messenger of Allah (ﷺ) said:
“Do not get angry.” The man repeated that several times and he replied, “Do not get angry.” Related by Al-Bukhari.
وَعَنْهُ أَنَّ رَجُلاً قَالَ: { يَا رَسُولَ اَللَّهِ! أَوْصِنِي.‏ فَقَالَ: لَا تَغْضَبْ, فَرَدَّدَ مِرَارًا.‏ قَالَ: لَا تَغْضَبْ }  أَخْرَجَهُ اَلْبُخَارِيُّ.‏  1‏ .‏‏1 ‏- صحيح.‏ رواه البخاري (6116)‏.‏