He said: Abul Hasan Ali b. Khalid al-Maraghi reported to me from al-Qasim Ibn Muhammad al-Dallal, who reported from Ismail b. Muhammad al-Muzni, who reported from Uthman b.Saeed, who reported from ALI b. Ghurab, from Musa b. Qais al-Hadhrami, from Salema b. Kuhail, from Ayadh b. Ayadh, from his father, who said:
Once ALI B. ABI TALIB (ASWS) , peace be upon him, passed by a group of people among whom was Salman, may ALLAH (SWT) bless him with mercy. So Salman told them: "Be attached to this man (i.e. ALI (ASWS) ) for no one else will inform you of the intimate things about your PROPHET (SAWW) except he."
(Ref Al-Amali Shaikh Mufeed The Forty Second Assembly Hadees No.6)