Tawatur Not Recorded
There is no credible history of the first hundred years after death of Muhammad صلى الله عليه وسلم if I’m not wrong.
It would be difficult but better than nothing
Like we can say that the word gay meant happy (assume it doesn’t mean that anymore) because we have records of people using it that way. If we didn’t have those records we would assume that it always just meant homosexual
Faisal Bhai Than why do you Believe the Quran(Written recorded Book) to be Authentic if you cant prove authenticity of a written word 1400 years ago? Nowhere does the Quran mention that it was transmitted through ijma and Tawattur of Sahaba. The Quran only mentions that The Prophet himself collected the Quran and himself was responsible for its preservation. (albeit through God & Angel Gabriel).