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: 6120
Abu Ayyub reported Allah's Messenger (may peace be upon him) as saying: The tribes of Ansar, Muzaina and Juhaina and Ghifar and Ashja' and those from Banu 'Abdullah, they are my friends amongst the people and Allah and His Messenger are their protectors.