Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) said: Two men insulted each other in the presence of the Prophet (peace and blessings be upon him), and one of them became intensely angry. The Prophet (peace and blessings be upon him) said: "I know a word which, if he were to say it, Allah would remove from him what he is feeling." The Prophet (peace and blessings be upon him) was asked: What is it? He (peace and blessings be upon him) said: "'Allahumma inni a'udhu bika min al-shaytan al-rajim' (O Allah, I seek refuge in You from Satan, the accursed)."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17423