Bidʿah is a belief or practice introduced or adopted as religion after the Messenger of Allah ﷺ, the Companions and the Successors. Here the discussion concerns a narrator’s deviant beliefs.
• This is the ninth cause in the studied list of reasons for unreliability.
• Something merely being new is not the whole definition; its adoption as religion is also part of it.
1. Lexical background: the root carries meanings of producing, newly inventing and being without a parallel.