Sahih Bukhari
Merits of the Helpers in Madinah (Ansaar)
Volume: 005 / Book Number: 058 / Hadith Number: 127
Narrated 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."