Criteria for Acknowledgment of Khabar-iWahed (Single Hadith) and its Scientific Implications

There are two approaches among the faqihs about the criteria of acknowledgment of Khabar-i Wahid and its issuance by the infallible (a): first, issuance authenticity which presumes the authenticity of issuance of a khabar (a report, tradition etc.) through any reasonable means; second, evidential authenticity which presumes the document of khabar as the only means to find its authenticity and if the document is weak, it does not accept any other means for its authenticity. Those who believe in each of these two approaches have provided reasons from the intellect and from narrations as well as the procedure adopted by the rational individuals. Having mentioned the reasons of both sides, the author has criticized the evidential authenticity and has accepted the criterion of issuance authenticity. In the final section of the article, the scientific implications of both approaches have been investigated in detail to clarify the importance of such criteria.