(27) باب مَا يُكْرَهُ مِنْ ثَنَاءِ السُّلْطَانِ، وَإِذَا خَرَجَ قَالَ غَيْرَ ذَلِكَ
Narrated Muhammad bin Zaid bin `Abdullah bin `Umar:
Some people said to Ibn `Umar, "When we enter upon our ruler(s) we say in their praise what is contrary to what we say when we leave them." Ibn `Umar said, "We used to consider this as hypocrisy."
Reference: Sahih al-Bukhari 7178
In-book reference: Book 93, Hadith 41
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 89, Hadith 289