Musnad Abu Ya'la al-Mawsili 3:354

Zuhayr narrated to us, Waki' narrated to us, Sufyan narrated to us, from Habib ibn Abi Thabit, from Abu Wa'il, from Abu al-Hayyaj al-Asadi, who said: Ali said to me, "Shall I not send you on that which the Messenger of Allah, peace and blessings of Allah be upon him, sent me? That I shall not leave any image without effacing it, and I shall not leave any grave without leveling it."