(17) باب مَا ذُكِرَ عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي الصُّلْحِ بَيْنَ النَّاسِ
Kathir bin 'Amr bin 'Awf Al-Muzani narrated from his father, from his grandfather, that the Messenger of Allah (ﷺ) said:
"Reconciliation is allowed among the Muslims, except for reconciliation that makes the lawful unlawful, or the unlawful lawful. And the Muslims will be held to their conditions, except the conditions that make the lawful unlawful, or the unlawful lawful."
Reference: Jami` at-Tirmidhi 1352
In-book reference: Book 15, Hadith 32
English translation: Vol. 3, Book 13, Hadith 1352