Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) said: "The religion is sincere goodwill (nasihah)." It was asked: For whom, O Messenger of Allah? He (peace and blessings be upon him) said: "For Allah, for His Book, for His Prophet, and for the leaders of the Muslims and their common folk."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11152