Sahih Muslim Book 45, Hadith 129
You will find the worst amongst the people one having double face. He comes to some people with one face and to the others with the other face.
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.
A liar is not one who tries to bring reconciliation amongst people and speaks good (in order to avert dispute), or he conveys good. Ibn Shihab said he did not hear that exemption was granted in anything what the people speak as lie but in three cases: in battle, for bringing reconciliation amongst persons and the narration of the words of the husband to his wife, and the narration of the words of a wife to her husband (in a twisted form in order to bring reconciliation between them).