Musnad Abu Ya'la al-Mawsili 111:86

Musa narrated to us, Abd al-Rahman narrated to us, from Sufyan, from Habib, from Sa'id ibn Jubayr, from Ibn Abbas, from the Prophet, may Allah bless him and grant him peace, who said: "No man who believes in Allah and the Last Day hates the Ansar, or [rather] Allah and His Messenger will hate him."