either he claims necessity or he sees or he hears from an infallible truthful person and he claims to know his truthfulness and infallibility either out of necessity or out of sight.
فانه اما ان يدعي الضرورة او النظر او السماع من معصوم صادق يدعى معرفة صدقه وعصمته ايضا اما ضرورة او نظرا