Before one word was written down man believed in God and worshipped God. It came from stories passed down though the centuries. In other words Oral Tradition.
Yet God has given us His written word throughout time so we have a written account of His truth.
Exodus 20 is the first instance of a written account of God speaking to man. This was later expanded to the entire Law...which was written down.
The appeal to the written word, for it does not change unlike Roman Catholic "tradition", shows the superiority of the written word in these matters.
An interesting word study on tradition shows it is usually condemned in the Bible.
A word study on write is also very interesting. I used biblegateway.com for both.
I encourage you to do the same.
Oral tradition was one thing. When the patriarchs talked about God’s law, that was a different matter. Getting the former wrong would be a cause for correction or further instruction. Getting the latter wrong would get you stoned to death.
Prove it.