there fixed it because the Scriptures clearly tell us that the doctrine of Yah’shua, the ‘Alef-Tav’ was in the beginning and His doctrine was written by Moshe and it has never changed.
The oral word and preaching of the apostles preceded the written word, considering the best evidence showed that 30 years passed before the earliest epistles were written.
Jesus gave all authority to the apostles who in turn passed on their authority to their successors.