In the name of Allah, Most Gracious, Most Merciful.
Narrated Abu-Huraira (may Allah be pleased with him): ‘Allah’s Messenger (May Allah exalt his mention and protect him from imperfection) asked: “Do you know what is slandar?” They replied: “Allah and His Messenger know best.” He said: “It is saying something about your brother that he dislikes.” Someone asked: “Suppose that what I said about my brother was true?” He replied: “If what you have said about him is true you have backbitten him, and if it is not true you have slandered him.”‘ (Muslim)
Riyaadiss-Saliheen (The Meadows of the Righteous) (Abridged)
By Imam An Nawawi Vol. (2)
Publisher: Dar Al-Manarah
Chapter 236, Page 962, Number 815