Some people said to Ibn ʿUmar, "When we enter upon our ruler(s) we say in their praise what is contrary to what we say when we leave them." Ibn ʿUmar said, "We used to consider this as hypocrisy."  

أُنَاسٌ لاِبْنِ عُمَرَ إِنَّا نَدْخُلُ عَلَى سُلْطَانِنَا فَنَقُولُ لَهُمْ خِلاَفَ مَا نَتَكَلَّمُ إِذَا خَرَجْنَا مِنْ عِنْدِهِمْ قَالَ كُنَّا نَعُدُّهَا نِفَاقًا  

Messenger of Allah ﷺs said, "The worst of all mankind is the double-faced one, who comes to some people with one face and to others, with another face."  

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