I really find this topic interesting. I am still not finding where the NT ever claims to be the "word of God" as the OT does.
The apostles went out and preached to the people. Then later they wrote this to them regarding the preaching/letters that they gave/sent to the people
1Th 2:13 And for this cause we also thank God without ceasing, that, when ye received from us the word of the message, even the word of God, ye accepted it not as the word of men, but, as it is in truth, the word of God, which also worketh in you that believe.Php 2:13 for it is God who worketh in you.....Joh 1:1 ....and the Word was God.
It worketh in those that believe. Only the Word of God can work in us, because Jesus said, the Word is the Seed and your heart is the ground it falls in.Luk 8:11 Now the parable is this: The seed is the word of God.
Plus of course we have the numeric pattern that backs this all up