What did the Prophet Muhammad (saw) say about making an accusation against someone if they are innocent?
 Narrated Abu Dhar:                     That he heard the Prophet saying, "If somebody accuses another of Fusuq (by calling him 'Fasiq' i.e. a wicked person) or accuses him of Kufr, such an accusation will revert to him (i.e. the accuser) if his companion (the accused) is innocent."