Ghibah ( ) is backbiting as understood in Islam. It is generally regarded as a major sin in Islam and compared in the Qur'an to 'the abomination of eating the flesh of a dead brother'.
There are two verses in the Quran about backbiting. Verse 12 of Surah Al-Hujurat says:
Verse 148 of Surah Al-Nisa says:
The hadith defines backbiting and generally advises Muslims not to do it about other Muslims and not to publicize and keep secrets (ÃÂêàçàçÃÂçóñçñ, kitma'n al-asra'r) of others.
Based on the mentioned second verse and some reliable hadiths Islamic jurists including Al-Nawawi in his book Gardens of the Righteous have declared backbiting in 6 cases to be valid -
Also, in the case of people who repeatedly commit crimes openly and show no remorse, and there is no possibility of repentance, if backbiting them openly can warn them and save others from their harm, then backbiting them is permissible.