صحیح ابن حبان
Ibn Hibban
كتاب السير
Book of Expeditions
باب طاعة الأئمة - ذكر الإخبار عما يجب على المرء من لزوم النصيحة في دين الله لنفسه وللمسلمين عامة-
Chapter on Obedience to Leaders - On the obligation of sincere advice in religion for oneself and all Muslims
2 hadith
Hadith 4574
Sayyiduna Tamim Dari (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings of Allah be upon him) said: "The religion is sincerity (good counsel)." He said this three times. The people asked, "O Messenger of Allah (peace and blessings of Allah be upon him)! For whom?" The Noble Prophet (peace and blessings of Allah be upon him) replied: "For Allah, for His Book, for His Messenger, for the leaders of the Muslims (the narrator is in doubt, or perhaps these are the words) for the leaders of the believers, and for their common people (to be sincere to them)."
Hadith 4575
Sayyiduna Tamim Dari (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings of Allah be upon him) said: "Be aware! Religion is sincerity. Be aware! Indeed, religion is sincerity. Be aware! Indeed, religion is sincerity." The people asked: "O Messenger of Allah (peace and blessings of Allah be upon him)! For whom?" The Noble Prophet (peace and blessings of Allah be upon him) replied: "For Allah, His Book, His Messenger, the leaders of the Muslims, and their common people (to be sincere to them)."