(23) باب الصُّلْحِ
Kathir bin 'Abdullah bin 'Amr bin 'Awf narrated from his father that his grandfather said:
"I heard the Messenger of Allah (ﷺ) say: 'Reconciling between Muslims is permissible, except reconciliation that forbids something that is allowed, or allows something that is forbidden.'"
Reference: Sunan Ibn Majah 2353
In-book reference: Book 13, Hadith 46
English translation: Vol. 3, Book 13, Hadith 2353