Sahih Muslim Book 31, Hadith Number 6047.
Chapter : The merits of Abu Dharr (Allah be pleased with him).
This hadith has been narrated on the authority of Humaid b. Hilal with the same chain of transmitters but with this addition: “As I came to Mecca, Unais said: (Well), go but be on your guard against the Meccans for they are his enemies and are annoyed with him.”