The Prophet ﷺ said, "Religion is sincere counsel."We asked, "To whom?"He replied, "To Allah, to His Book, to His Messenger, to the leaders of the Muslims, and to the Muslims in general."
أن النبي ﷺ قال: الدين النصيحة قلنا: لمن؟ قال: الله ولكتابه ولرسوله ولائمة المسلمين وعامتهم.
Muslim narrated it in the Book of Faith (55) from Muhammad bin Abbad Makki, who said, Sufyan narrated to us, he said, "I said to Suhayl, 'Amr narrated to us from Qaqa, from your father.'" He said, "I was hoping he would drop one man from the chain for me." He said, "So he said, 'I heard it from the man my father heard it from, who was a friend of his in Syria.'" Then Sufyan narrated to us, from Suhayl, from Ata bin Yazid, from Tamim Dari, and he related the hadith.Tirmidhi (1926), Nasai (4199, 4200), and Ahmad (7954) all narrated it through various routes from Abu Salih, from Abu Hurairah, that the Prophet ﷺ said, "Religion is sincere advice..." and so on.This is a mistake. The correct view is that it is the hadith of Tamim Dari, as Muhammad bin Nasr Marwazi stated in Taazim Qadr Salah (2/684-685), and as Daraqutni stated in Ilal (10/115-118).Bukhari said in Tarikh Saghir (26/2), "This whole hadith turns on Tamim, and it has not been established as sahih from anyone other than Tamim." This is what he said, but this does not rule out the hasan grading held by later scholars, who placed it between sahih and daif. The hadith has indeed come with a hasan chain from Ibn Umar, and that is the hadith that follows.