2 Thessalonians 2:5
2 Thessalonians 2:55Do you not remember that I told you these things while I was still with you?
The Watchtower typically passes over — "do you not remember that I told you these things while I was still with you?" — and moves quickly to verse 15 ("hold the traditions... whether by a spoken message or by a letter"). The "spoken message or letter" distinction in verse 15 is read as authorising two separate streams of apostolic teaching — written and oral — and the Governing Body claims custody of the oral stream as the modern "channel."
Verse 5 is the key that interprets verse 15. Paul explicitly says the content of his oral teaching when he was physically with the Thessalonians and the content of his letter are the same content. "Do you not remember that I told you these things while I was still with you?" — Paul is not adding a separate oral stream with different material. He is pointing out that what he has just written (2:1-4, about the coming of the Lord and the man of lawlessness) is the same teaching he delivered face to face.
When verse 15 then says "hold the traditions... whether by spoken message or by letter," the distinction is mode of delivery — not content of tradition. The paradosis is one apostolic deposit, conveyed in two forms. Jude 3 closes the deposit: "the faith entrusted once for all to the saints" — Greek hapax, emphatic, singular, complete. The Watchtower cannot name one apostolic oral tradition it has preserved from the first century that is not already in the New Testament — because the oral stream did not contain different material. It contained the same material.