32-35 Muhammad ibn Yahya al-Sowli narrated that Oan ibn Muhammad quoted on the authority of Sahl ibn al-Qasim, “Ar-Ridha’ (a.s.) heard one of his companions say
May God damn those who fought the Commander of the Faithful (a.s.).” Then Ar-Ridha’ (a.s.) told him, “Say: except for those who have repented and improved themselves.” Ar-Ridha’ (a.s.) then added, “The sin of those who disobeyed him (i.e. Imam Ali (a.s.)) and did not accompany him to fight corruption and the corrupt ones is even greater than that of those who fought him and then repented. And God made them succeed in repenting.”