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. (Using translation from Muslim 2526c)  

أَنَّهُ سَمِعَ رَسُولَ اللَّهِ ﷺ يَقُولُ «إِنَّ شَرَّ النَّاسِ ذُو الْوَجْهَيْنِ الَّذِي يَأْتِي هَؤُلَاءِ بِوَجْهٍ وَهَؤُلَاءِ بِوَجْهٍ»  

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. (Using translation from Muslim 2526c)  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «مِنْ شَرِّ النَّاسِ ذُو الْوَجْهَيْنِ الَّذِي يَأْتِي هَؤُلَاءِ بِوَجْهٍ وَهَؤُلَاءِ بِوَجْهٍ»  

[Machine] On the authority of the Prophet ﷺ , he said, "Whoever has two faces in this world will have two tongues of fire on the Day of Resurrection."  

عَنِ النَّبِيِّ ﷺ قَالَ «مَنْ كَانَ ذَا وَجْهَيْنِ فِي الدُّنْيَا كَانَ لَهُ لِسَانَانِ مِنْ نَارٍ يَوْمَ الْقِيَامَةِ»  

You would find people like those of mine, the good amongst you in the Days of Ignorance would be good amongst you in the days of Islam, provided they have an understanding of it and you will find good amongst people the persons who would be averse to position of authority until it is thrust upon them, and you will find the worst amongst persons one who has double face. He comes with one face to them and with the other face to the others. (Using translation from Muslim 2526a)  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «تَجِدُونَ النَّاسَ مَعَادِنَ فَخِيَارُهُمْ فِي الْجَاهِلِيَّةِ خِيَارُهُمْ فِي الْإِسْلَامِ إِذَا فَقُهُوا وَتَجِدُونَ خَيْرَ النَّاسِ فِي هَذَا الْأَمْرِ أَكْرَهَهُمْ لَهُ قَبْلَ أَنْ يَقَعَ فِيهِ وَتَجِدُونَ مِنْ شَرِّ النَّاسِ ذَا الْوَجْهَيْنِ الَّذِي يَأْتِي هَؤُلَاءِ بِوَجْهٍ وَهَؤُلَاءِ بِوَجْهٍ»