Sahih Bukhari Volume 005, Book 058, Hadith Number 127.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 58. Merits of the Helpers in Madina (Ansaar)
Narated By Al-Bara : I heard the Prophet saying (or the Prophet said), "None loves the Ansar but a believer, and none hates them but a hypocrite. So Allah will love him who loves them, and He will hate him who hates them."