Musnad Ahmad 5:604

Abdullah narrated to us, Abu Dawud al-Mubaraki Sulayman ibn Muhammad narrated to me, Abu Shihab narrated to us, from Shu'bah, from al-Hakam, from Abu al-Muwarr'i, from Ali, who said: We were with the Messenger of Allah, peace and blessings of Allah be upon him, at a funeral, and he said: "Whoever goes to Medina, let him not leave a grave without leveling it, nor an image without effacing it, nor an idol without breaking it." He said: A man stood up and said: "I will." Then he feared the people of Medina and sat down. Ali said: So I went, then I came and said: "O Messenger of Allah, I did not leave a grave in Medina without leveling it, nor an image without effacing it, nor an idol without breaking it." He said: So he said: "Whoever returns and does any of that has disbelieved in what was revealed to Muhammad. O Ali, do not be a tempter—or he said: an arrogant one—nor a merchant, except for the merchant of good, for those are the ones who procrastinate in action."