The Prophet ﷺ said, "The worst people in the Sight of Allah on the Day of Resurrection will be the double faced people who appear to some people with one face and to other people with another face."  

قَالَ النَّبِيُّ ﷺ تَجِدُ مِنْ شَرِّ النَّاسِ يَوْمَ الْقِيَامَةِ عِنْدَ اللَّهِ ذَا الْوَجْهَيْنِ الَّذِي يَأْتِي هَؤُلاَءِ بِوَجْهٍ وَهَؤُلاَءِ بِوَجْهٍ