It is narrated from Sayyiduna Sulayman bin Surad (may Allah be pleased with him): The Prophet (peace and blessings be upon him) heard two men exchanging harsh words; one of them became angry and his anger grew intense. The Prophet (peace and blessings be upon him) said: "I know a word which, if he were to say it, Satan would go away from him." Then the man came to him, and he (peace and blessings be upon him) said: "Say: 'A'udhu billahi min al-shaytan' (I seek refuge with Allah from Satan)."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6459