Sahih Muslim
The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fadail Al-Sahabah)
Book Number: 031 / Hadith Number: 6047
This hadlth 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."