Extra Rules In Hadith Science Apart From Verifying The Chain Of Narration
This is because Hadith is based on isolated reportings ( Khabr-e-Wahid ) which is a less credibles mode of transmission when compared with Quran which is received through Ijma and Tawatur ( the most credible means ). Just because a person is known to be truthful, there is still a possibility of a genuine misunderstadning on his part or a hidden political bias on his end etc. etc. The reason we have rigorous principles in place while approaching any Hadith is to make sure that these limitations in individual reportings could be minimized. But still, they could never be eliminated completely because despite these controls in place, certain inherent limitations embedded with this particular mode of transmission (i.e. Akhbar-i-ahad ) could never be overcome. That is why we can never attain absolute assurance from Hadith; at best, after applying all the principles of understanding Hadith very carefully, we can attain only reasonable assurance .