Musnad Abu Ya'la al-Mawsili 146:4

'Abd al-Ghaffar ibn 'Abd Allah ibn al-Zubayr narrated to us, Kurayd ibn Rawahah al-'Ayshi narrated to us, Shu'bah narrated to us, from Abu al-Tayyah, who said: I heard Anas ibn Malik saying: The Messenger of Allah (may Allah bless him and grant him peace) said: "The love of the Ansar is a sign of every believer and hypocrite. So whoever loves the Ansar, then by my love he loves them; and whoever hates them, then by my hatred he hates them."