Imam Al-Nawawi’s Riyad-us-Saliheen
Prohibition of Maligning
Allah, the Exalted, says:
“And those who annoy believing men and women undeservedly, bear on themselves the crime of slander and plain sin.” (33:58)
1565. `Abdullah bin `Amr bin Al-`As (May Allah be pleased with them) reported: The Messenger of Allah (sallallaahu alayhi wa sallam) said, “A (true) Muslim is one from whose tongue and hand the Muslims are safe; and a Muhajir (Emigrant) is he who leaves the deeds which Allah has prohibited.”
[Al-Bukhari and Muslim].
1566. `Abdullah bin `Amr bin Al-`As (May Allah be pleased with them) said: The Messenger of Allah (sallallaahu alayhi wa sallam) said, “He who desires to be rescued from the fire of Hell and to enter Jannah, should die in a state of complete belief in Allah and the Last Day, and should do unto others what he wishes to be done unto him.”