Tawatur Not Recorded
And how would you prove authenticity of that written record written by just someone?
Where is this consensus recorded? Like if we take a word of English that means something completely different and has lost it’s old meaning. Now if we don’t have any records for it’s old meaning we will simply would simply assume that the way we are using it now is the way it was used before.
How can we then prove that this ijma and tawatur we are seeing in front of our eyes TODAY was there 1400 years ago? We can’t even use the fiqh books then to eliminate bidah like adhan in the ears of newborn (if the authenticity of such texts, as you said, is not credible or able to be proved as such)
The Quran shouldn’t have to mention that. Rather an analysis of the texts surrounding it lead us to believe it was transmitted in that way. I vaguely remember reports of the ‘qiratul aamah’ being the same between a few named sahabah like Abu bakr and Ali رضي الله عنهم أجمين