What is a sect? [split from 73 sects]

[cricketplaya]

@Basim_Ali

Oh, he did? Hmm… maybe that’s why, on the occasion of the Battle of Siffin, the issue that whether or not Uthman’s murder was just and should his murderers be punished or not, needed discussion? Last time I checked Imam Ali (as) was reluctant to accept that Uthman’s has justly ruled the Muslim Ummah and thereby held ‘talks’ to discuss it and come to a conclusion and act accordingly [widely known as the arbitration between Abu Musa al-Ashari and Amr bin al A’as].

So is Ali (ra) not an infallible Imam to you?