Backbiting (Gheebah)

In the Light of Quran and Hadith

Allah (The Almighty) has said: O ye who believe! Avoid suspicion as much (as possible): for suspicion in some cases is a sin: And spy not on each other behind their backs. Would any of you like to eat the flesh of his dead brother? Nay, ye would abhor/hate it..(So abhore/hate the backbiting) but fear Allah. For Allah is Forgiving, Most Merciful. {Al-Quran: Surah-49~Ayah-12}

Anas (R.A) narrated that the Messenger of Allah (Peace be upon him) said, “When I was ascended to heaven, I passed by a people who had copper nails with which they scratched their faces and chests, and I said, “O Jibrael, who are these?’ He said, “These are those who used to eat other people’s flesh and attack their honour.” (Abu Dawood)

Difference between Slandering and Backbiting: 
Abu Hurayrah (R.A.) narrated that the Prophet (Peace be upon him) said, “Do you know what backbiting is?” Companions (R.A.) said, “Allah and His Messenger know best.” He (Peace be upon him) then said, “It is to say something about your brother that he would dislike.” Someone asked him, “But what if what I say is true?” The Messenger of Allah (Peace be upon him) said, “If what you say about him is true, you are backbiting him, but if it is not true then you have slandered him.”(Muslim)