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Takhrij Hadith 538: ""Do you know what backbiting…"
Abu Hurayrah reported that the Messenger of Allah ﷺ said:
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"Do you know what backbiting is?" They replied: "Allah and His Messenger know best." He said: "It is mentioning your brother with something he dislikes." It was asked: "What if what I say about my brother is true?" He replied: "If what you say is true, then you have backbitten him; and if it is not true, then you have slandered him."”