Narrated Mu'adh ibn Jabal:

Two men reviled each other in the presence of the Prophet ﷺ and one of them became excessively angry so much so that I thought that his nose will break up on account of excess of anger. The Prophet ﷺ said: I know a phrase which, if he repeated, he could get rid of this angry feeling. They asked: What is it, Messenger of Allah? He replied: He should say: I seek refuge in Thee from the accursed devil. Mu'adh then began to ask him to do so, but he refused and persisted in quarrelling, and began to enhance his anger.

حَدَّثَنَا يُوسُفُ بْنُ مُوسَى، حَدَّثَنَا جَرِيرُ بْنُ عَبْدِ الْحَمِيدِ، عَنْ عَبْدِ الْمَلِكِ بْنِ عُمَيْرٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى، عَنْ مُعَاذِ بْنِ جَبَلٍ، قَالَ اسْتَبَّ رَجُلاَنِ عِنْدَ النَّبِيِّ ﷺ فَغَضِبَ أَحَدُهُمَا غَضَبًا شَدِيدًا حَتَّى خُيِّلَ إِلَىَّ أَنَّ أَنْفَهُ يَتَمَزَّعُ مِنْ شِدَّةِ غَضَبِهِ فَقَالَ النَّبِيُّ ﷺ " إِنِّي لأَعْلَمُ كَلِمَةً لَوْ قَالَهَا لَذَهَبَ عَنْهُ مَا يَجِدُهُ مِنَ الْغَضَبِ " . فَقَالَ مَا هِيَ يَا رَسُولَ اللَّهِ قَالَ " يَقُولُ اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الشَّيْطَانِ الرَّجِيمِ " . قَالَ فَجَعَلَ مُعَاذٌ يَأْمُرُهُ فَأَبَى وَمَحِكَ وَجَعَلَ يَزْدَادُ غَضَبًا .