Musannaf Ibn Abi Shaybah

Hazrat Salman bin Sard narrates that two men quarreled. Then one of them became very angry. So the Holy Prophet (peace and blessings be upon him) said: I know a word, if he recites this word, his anger will go away. That word is: I seek refuge with Allah from the accursed Satan.

Hazrat Mu'adh bin Jabal narrates that two men exchanged insults in the presence of the Noble Prophet, peace and blessings be upon him. Then one of them became extremely angry, to the extent that I thought his nose had swollen with rage! The Messenger of Allah, peace and blessings be upon him, said: I know a word—if this angry person were to recite it, his anger would go away. That word is: I seek refuge with Allah from Satan.