It is also permissible to mention the bad qualities of somebody for marriage purposes in case an advice is sought. To identify them without resorting to such names is however better. Imam Al-Bukhari has obviously justified the backbiting of wicked people to save people from being deceived from their appearance. If people are not informed of the real conduct of such persons, their religious as well as worldly life will be exposed to a grave danger. For this reason, the backbiting of wicked persons for the purpose of warning others is permissible.
Hypocrites are also people of mischievous and doubtful conduct.
It is, therefore, not only permissible but necessary to make people aware of their real position so that people become cautious about them and their religious and worldly life may remain safe from their machinations. He asked him whether he had said that or not. This incident goes to prove that exposing the designs and conspiracies of hypocrites does not form backbiting. In fact, it is essential to keep people informed about them in the interest of Islam and Muslims. Abu Sufyan is a niggardly man and does not give me and my children adequate provisions for maintenance unless I take something from his possession without his knowledge.