An Nawawi's 40 Hadith (7)

On the authority of Tamim Al-Dari that the Prophet(sallallahu alayhi wa sallam) said:

"Religion is sincerity[1]". We said: "To whom?" He said: "To Allah and His Book, and His Messenger, and to the leaders of the Muslims and their common folk".
Narrated by Muslim

[1] The Arabic word nasiha has a variety of meanings, the most common being "good advice", which is obviously unsuitable in the context. It also gives the meaning of "doing justice to a person or situation", "probity", "integrity, and the like.