Salam Alaikum, Recently, I came across this narration from Imam Sadiq (as): Imam Sadiq was asked by one of his students– why are you ma’soom? He answered, you are also infallible in terms of certain sins – you just need to expand it. As an example, he offered the student a red hot charcoal to eat. The student refused and said you are offering me the hot charcoal and have the meat to yourself? I can’t; it is hot there is no way I can do it. In that regard the Imam demonstrated the “infa