Musnad Abu Ya'la al-Mawsili 111:3

Muhammad ibn Bakkar narrated to us, Hudayj ibn Mu'awiyah narrated to us, Abu Ishaq narrated to us, from Sa'id ibn Jubayr, who said: A man came to Ibn Abbas and said, "The accursed Hassan has come." Ibn Abbas said, "He is not accursed. He struggled alongside the Messenger of Allah, may Allah bless him and grant him peace, with his tongue and his soul."