كتاب البر والصلة والآداب
45  
The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship
(26)
Chapter: Criticism Of The One Who Is Two-Faced, And The Prohibition Of Doing That
(26)
باب ذَمِّ ذِي الْوَجْهَيْنِ وَتَحْرِيمِ فِعْلِهِ ‏‏
Sahih Muslim 2526 d

Abu Huraira reported that he heard Allah's Messenger (ﷺ) as saying:

The worst amongst people is one with the double face. He comes to some people with one face and to others with the other face.
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا لَيْثٌ، ح وَحَدَّثَنَا مُحَمَّدُ بْنُ رُمْحٍ، أَخْبَرَنَا اللَّيْثُ، عَنْ يَزِيدَ بْنِ أَبِي حَبِيبٍ، عَنْ عِرَاكِ بْنِ مَالِكٍ، عَنْ أَبِي هُرَيْرَةَ، أَنَّهُ سَمِعَ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏ "‏ إِنَّ شَرَّ النَّاسِ ذُو الْوَجْهَيْنِ الَّذِي يَأْتِي هَؤُلاَءِ بِوَجْهٍ وَهَؤُلاَءِ بِوَجْهٍ ‏"‏ ‏.‏
Reference : Sahih Muslim 2526d
In-book reference : Book 45, Hadith 128
USC-MSA web (English) reference : Book 32, Hadith 6301
  (deprecated numbering scheme)