Musnad Ahmad 5:122

Yunus ibn Muhammad narrated to us, Hammad—meaning Ibn Salamah—narrated to us, from Yunus ibn Khabbab, from Jarir ibn Hayyan, from his father, that Ali said: "I will send you on the mission that the Messenger of Allah (ﷺ) sent me on: 'He commanded me to level every grave and to efface every idol.'"