Imamia scholars talked about basis of affirming the authenticity of ahadith mentioned in Shia books of ahadith. Quite a few number of them agree that the only criterion in scrutinizing the authenticity of ahadith is not scrutinizing their documents per.se. In this essay, the view points of Shia scholars-from 4th century up to now, such as Shaikh Mortaza Ansari, Mola Muhammad Baqir Vahid Behbahani, Mola Muhammad Taghi Majlesi, Allameh Muhammad Baqir Majlesi, ... have been mentioned.