Musnad Ahmad 658:33

Bahz narrated to us, Shu'bah narrated to us, 'Adi ibn Thabit informed me, he said: I heard Al-Bara' ibn 'Azib say: The Messenger of Allah, peace and blessings of Allah be upon him, said: "None loves the Ansar except a believer, and none hates them except a hypocrite. Whoever loves them, Allah loves him, and whoever hates them, Allah hates him." Shu'bah said: I said to 'Adi: "Did you hear it from Al-Bara'?" He said: "He narrated it to me."