The Prophet sallallaahu 'alayhi wa sallam said (three times): "The Deen is naseehah (sincerity and sincere advice) On the authority of Tamim Al-Dari that the prophet said: p "Religion is sincerity". 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 .