It is Paul who makes the distinction of modes in which
the Revelation of God to His People can be handed on.
Paul also called the process of handing on the Word of
God "tradition." He then terms two ways in which
are transmitted, by word, orally, and by letter, written
2 Thessalonians 2:15
Therefore, brothers, stand firm and hold fast to the
) that you were taught, either
by an oral statement or by a letter of ours.