Abu Hurayra reported that the Messenger of Allah, (ﷺ), said, "The worst person is someone who is two-faced. He is the person who comes to one group of people with one face and another group of people with another face."

حَدَّثَنَا إِسْمَاعِيلُ قَالَ‏:‏ حَدَّثَنِي مَالِكٌ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللهِ صلى الله عليه وسلم قَالَ‏:‏ مِنْ شَرِّ النَّاسِ ذُو الْوَجْهَيْنِ، الَّذِي يَأْتِي هَؤُلاَءِ بِوَجْهٍ، وَهَؤُلاَءِ بِوَجْهٍ‏.‏