Riyad as-Salihin (The Meadows of the Righteous)
by Imam Nawawi
272. Chapter: On the prohibition against having a bad opinion of the Muslims unnecessarily
Allah Almighty says, "O you who believe! Avoid most suspicion. Indeed some suspicion is a crime." (49:12)
1573. Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "Beware of suspicion. Suspicion is the falsest kind of speech." [Agreed upon]
