What he said watching a man's face go red
Two men were insulting each other in front of him.
إِنِّي لأَعْلَمُ كَلِمَةً لَوْ قَالَهَا لَذَهَبَ عَنْهُ مَا يَجِدُ لَوْ قَالَ أَعُوذُ بِاللَّهِ مِنَ الشَّيْطَانِ الرَّجِيمِ
Innī la-aʿlamu kalimatan law qālahā la-dhahaba ʿanhu mā yajid. Law qāla: aʿūdhu bi-Llāhi mina-sh-shayṭāni-r-rajīm
“I know a word which, if he said it, what he is feeling would leave him. If he said: I seek refuge in Allah from the rejected Satan.”
Where this comes from
They turned to the man and said: do you not hear what the Prophet is saying? He said: I am not mad. He was too far into it to take the way out, and it was said in front of him anyway.
The full narration
Narrated Sulaiman bin Sarad:Two men abused each other in front of the Prophet (ﷺ) while we were sitting with him. One of the two abused his companion furiously and his face became red. The Prophet (ﷺ) said, "I know a word (sentence) the saying of which will cause him to relax if this man says it. Only if he said, "I seek refuge with Allah from Satan, the outcast.' " So they said to that (furious) man, 'Don't you hear what the Prophet (ﷺ) is saying?" He said, "I am not mad
Source
Ṣaḥīḥ al-Bukhārī · 6115
- Agreed upon as authentic (al-Bukhārī / Muslim)