Musnad Ahmad 5:292

'Abdullah narrated to us, Abu Bakr ibn Abi Shaybah narrated to us, Abu Khalid al-Ahmar narrated to us, from Mansur ibn Hayyan, from Abu al-Tufayl, who said: We said to 'Ali: "Inform us of something the Messenger of Allah (peace and blessings of Allah be upon him) confided in you." He said: "He did not confide in me anything that he kept hidden from the people, but I heard him say: 'Allah has cursed the one who sacrifices to other than Allah, and Allah has cursed the one who shelters an innovator, and Allah has cursed the one who curses his parents, and Allah has cursed the one who alters the boundaries of the land'—meaning the landmarks."