Questioner: O Shaikh, for example, a person who declares the Companions to be disbelievers, for example, he says that Yazeed ibn Mu’aawiyah is a faasiq or a faajir and likewise his father, ya’ni, is such a person a disbeliever [due to what he said] or a faajir or a faasiq?
Al-Albaani: It differs, Yaa akhi, according to the person: is he ignorant, is he a scholar, has the proof been established against him from the Book of Allaah and the Sunnah of Allaah’s Prophet ﷺ, is he someone who is obstinate [in his opinion], is he someone who has misinterpreted [the texts]? All of these things prevent the people of knowledge from [both] rushing to call him a disbeliever or from rushing to state that he is not a disbeliever. All of these checks have to be implemented so that after them we will have the ability to state whether he is a disbeliever or not.
Al-Hudaa wan-Noor, 342.