The Book of Virtue, Good Manners and Joining of the Ties of Relationship (Kitab Al-Birr was-Salat-I-wa'l-Adab)

Muslim :: Book 32 : Hadith 6300

Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: The worst amongst the people is the double-faced one; he comes to some people with one face and to others with the other face.