People who killed Imam Hussain were also Muslims. Is that correct? Yes they were from the Muslims but of course were deviated from the right path. Nafi’ b. Hilal al-Jamali (a companion of Imam al-Husayn) was fighting on that day, reciting: “I am al-Jamali. I believe in the religion of `Ali.” A man called Muzahim b. Hurayth came against him, crying, “I follow the religion of ‘Uthman.” Nafi’ replied, “Rather you follow the religion of Satan.” Then he attacked and killed him. Source - al-Tabari, Ta’rikh (English translation), vol. 19, pp. 136–7 In another example, we have ‘Amr b. al-Hajjaj, when he approached the followers of al-Husayn, say to them: “People of Kufa, stay steadfast in your obedience and unity (jama'ah). Do not have any doubts about fighting against those who have strayed from the true religion and have opposed the imam.” Al-Husayn retorted, “‘Amr b. al-Hajjaj, are you urging the people against me? Are we the ones who have strayed from the tru