Sayyiduna Abu Tufail (may Allah be pleased with him) says that we asked Sayyiduna Ali (may Allah be pleased with him), "Tell us something which the Prophet (peace and blessings of Allah be upon him) told you especially." He replied: "The Prophet (peace and blessings of Allah be upon him) did not tell me anything privately which he concealed from other people, but I did hear the Prophet (peace and blessings of Allah be upon him) say: 'May Allah's curse be upon the one who sacrifices an animal in the name of other than Allah, may Allah's curse be upon the one who gives shelter to an innovator, may Allah's curse be upon the one who curses his parents, and may Allah's curse be upon the one who alters the boundaries of the land.'"