โ€”โ€” on Muhammad (4/5)
It is of course, alike any other method, not perfect, but not only did they record the names of people telling the stories, but also wrote biographies of all the people in the chain so people would know even as much as things like whether they had a good memory or not. As a result we get a high level of certainty from the Hadith that someone said the things that are being claimed.