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It is prohibited in Islam to backbite a believer; does this apply to a person who says that he is a Muslim when asked but he openly commits sins, such as consuming unlawful food and drink, being in forbidden relationships, etc.?
If the believer commits sins openly then it is allowed to backbite and criticize him.
Backbiting is prohibited in Islam. So how can a man raise his voice against a cruel person or tell other people about the wicked nature of any person or system? If the wicked person was an oppressive ruler, is backbiting such a person permitted?
Yes, it is permissible to backbite a person who is openly committing sins, and amongst the greatest of sins is oppression and aggression.