Hazrat Abu Tufail narrates that I was present in the service of Hazrat Ali (may Allah be pleased with him) when a person came to him and asked, "Did the Prophet (peace and blessings be upon him) tell you any secret matters?" Hazrat Ali (may Allah be pleased with him) became angry and replied, "The Prophet (peace and blessings be upon him) did not whisper to me anything that he concealed from the people, except that he taught me four words." The man asked, "What are those words?" He (may Allah be pleased with him) said: "May Allah's curse be upon the one who curses his parents, and may Allah's curse be upon the one who sacrifices in the name of other than Allah, may Allah's curse be upon the one who gives shelter to a mischief-maker, and may Allah's curse be upon the one who changes the boundaries of the land."