Re: why we use word Imam with Hazrat Hussain R.A
The most explicit proof of self inflicted injury comes Owais Qarni, the great Muslim Sahaba, praised by both Shia as well as Sunni erudites, had an immense love for the Holy Prophet (s.a.w). When the news reached him in Yemen that two teeth of the Holy Prophet (s.a.w) were broken in the battle of Ohad, he extracted all his teeth. When the Holy Prophet (s.a.w) got the news in Medina that Owais had struck down all his teeth, he (s.a.w) exclaimed, "Indeed Owais is our devoted friend."
This event can be found written in 'Tazkeratul Aulia' by Sheikh Fariddun Attar, also 'Ihsanul Uyun' commonly known as 'Seerate Halbia' vol II, page 295.
there's ur source, now tell me ??? "i dont believe in books" thats what i am expecting, and yea its not even a shia book.. its sunni source