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: 6121
Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: Quraish, Ansar, Muzaina, Juhaina and Ghifar, they are my friends and there is no friend of theirs besides Allah and His Messenger.