Nobody is denying that.
But this is what John says in chapter 20....
John 20:30-31 Now Jesus did many other signs in the presence of the disciples, which are not written in this book; 31 but these are written so that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in his name.
What is included in the book of John is enough for a person to come to salvation.
So, what exactly did Jesus teach that wasn't written down and how do we know what it is and how do we know that it has been handed down faithfully?
What are the proofs and where are the links to back those claims up?
There was a lot of teaching person to person. Even Paul talks about it. It’s not all written down.
Read the Early Church Fathers who were around when Jesus was there and when the Mass started. They knew the apostles and got a lot of stories from them that aren’t in the Bible.
See post #119