Abu Hurairah (RAA) narrated, ‘The Messenger of Allah (ﷺ) asked, “Do you know what backbiting is?” They replied, `Allah and His Messenger (ﷺ) know best.’ He said, “It is saying something about your brother which he dislikes.” Someone asked, ‘Supposing that what I said about my brother was true?’ and the Messenger of Allah (ﷺ) said:

“If what you say about him is true you have backbitten him and if it is not true you have slandered him.” Related by Muslim.

وَعَنْ أَبِي هُرَيْرَةَ ‏- رضى الله عنه ‏- أَنَّ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-قَالَ: { أَتَدْرُونَ مَا اَلْغِيبَةُ? قَالُوا: اَللَّهُ وَرَسُولُهُ أَعْلَمُ.‏ قَالَ: ذِكْرُكَ أَخَاكَ بِمَا يَكْرَهُ.‏ قِيلَ: أَرَأَيْتَ إِنْ كَانَ فِي أَخِي مَا أَقُولُ? قَالَ: إِنْ كَانَ فِيهِ مَا تَقُولُ فَقَدْ اِغْتَبْتَهُ, وَإِنْ لَمْ يَكُنْ فَقَدْ بَهَتَّهُ } أَخْرَجَهُ مُسْلِمٌ.‏ [1]‏ .‏