It is narrated from Sayyiduna Sulaiman bin Surad (may Allah be pleased with him), he said that two men abused each other in the presence of the Prophet (peace and blessings of Allah be upon him), so one of them became so angry that his face turned red. The Prophet (peace and blessings of Allah be upon him) looked at him and said: "Indeed, I know a word that if this person says it, his anger will cool down (that word is) «أَعُوذُبِاللَّهِمِنَالشَّيْطَانِالرَّجِيمِ»." So a man got up and went to that person and said: Do you know what the Prophet (peace and blessings of Allah be upon him) said? He (peace and blessings of Allah be upon him) said: "You should recite «أَعُوذُبِاللَّهِمِنَالشَّيْطَانِالرَّجِيمِ»." That man said: Do you think I am mad?
Hadith Referenceالادب المفرد / كتاب الغضب / 1319
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه البخاري، كتاب الأدب : 6048 و مسلم : 2610»