As if oral tradition was God's chosen means of preservation:
Now go, write it before them in a table, and note it in a book, that it may be for the time to come for ever and ever: (Isaiah 30:8)
And the Lord said unto Moses, Write this for a memorial in a book, and rehearse it in the ears of Joshua: for I will utterly put out the remembrance of Amalek from under heaven. (Exodus 17:14)
And it shall be, when he sitteth upon the throne of his kingdom, that he shall write him a copy of this law in a book out of that which is before the priests the Levites: (Deuteronomy 17:18)
Thus speaketh the Lord God of Israel, saying, Write thee all the words that I have spoken unto thee in a book. (Jeremiah 30:2)
Take thee a roll of a book, and write therein all the words that I have spoken unto thee against Israel, and against Judah, and against all the nations, from the day I spake unto thee, from the days of Josiah, even unto this day. (Jeremiah 36:2)
Then said I, Lo, I come: in the volume of the book it is written of me, (Psalms 40:7)
But he answered and said, It is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God. (Matthew 4:4)
And 62 other times, "It is written" in the NT.
Meanwhile you could make quite a compilation of all the inventions justified by invoking And there are also many other things which Jesus did, the which, if they should be written every one, I suppose that even the world itself could not contain the books that should be written. Amen. (John 21:25)