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.

أَنَّهُ سَمِعَ رَسُولَ اللَّهِ ﷺ يَقُولُ إِنَّ شَرَّ النَّاسِ ذُو الْوَجْهَيْنِ الَّذِي يَأْتِي هَؤُلاَءِ بِوَجْهٍ وَهَؤُلاَءِ بِوَجْهٍ