Musnad Ahmad 5:326

Abdullah narrated to us, Shayban Abu Muhammad narrated to us, Hammad ibn Salamah narrated to us, Yunus ibn Khabbab informed us, from Jarir ibn Hayyan, from his father, that Ali said to his father: "I will send you on that which the Messenger of Allah, peace and blessings of Allah be upon him, sent me: 'That you level every grave, and that you efface every idol.'"