Abu Tufail 'Amir b. Withila reported:

I was in the company of 'Ali b. Abi Talib, when a person came to him, and said: What was it that Allah's Apostle (s.a.w.a.) told you in secret? Thereupon he (liadrat 'All) was enraged and said: Allah's Apostle (s.a.w.a.) did not tell me anything in secret that he hid from people, except that he told me four things. He said: Com- mader of Faithful, what are these? He said: Allah cursed him who cursed his father; Allah cursed him who sacrificed for anyone besides Allah; and Allah cursed him who accommodates an innovator (in religion) ; and Allah cursed him who changed the minarets (the boundary lines) of the land.