There is a way to demonstrate what is actually practiced without just wordsmithing and word searching. The demonstration of using God's inspired words to teach and confirm doctrines has been done since Sinai. Therefore, if the OP,
@Tree of Life, can demonstrate in his paper that souls in both the OT and NT demonstrated using God's inspired Words alone for correction, reproof, edification, teaching and doctrine, then he will succeed in his argument.
Jesus actually confirmed the witness of the apostles using the OT scriptures was enough:
Luke 24: NKJV
So they said to Him, “The things concerning Jesus of Nazareth, who was a Prophet mighty in deed and word before God and all the people, 20 and how the chief priests and our rulers delivered Him to be condemned to death, and crucified Him. 21 But we were hoping that it was He who was going to redeem Israel. Indeed, besides all this, today is the third day since these things happened. 22 Yes, and certain women of our company, who arrived at the tomb early, astonished us. 23 When they did not find His body, they came saying that they had also seen a vision of angels who said He was alive. 24 And certain of those
who were with us went to the tomb and found
it just as the women had said; but Him they did not see.”
25 Then He said to them,
“O foolish ones, and slow of heart to believe in all that the prophets have spoken! 26 Ought not the Christ to have suffered these things and to enter into His glory?” 27 And beginning at Moses and all the Prophets, He expounded to them in all the Scriptures the things concerning Himself.
[...]
44 Then He said to them,
“These are the words which I spoke to you while I was still with you, that all things must be fulfilled which were written in the Law of Moses and the Prophets and the Psalms concerning Me.” 45 And He opened their understanding, that they might comprehend the Scriptures.
46 Then He said to them, “Thus it is written, and thus it was necessary for the Christ to suffer and to rise from the dead the third day, 47 and that repentance and remission of sins should be preached in His name to all nations, beginning at Jerusalem. 48 And you are witnesses of these things. 49 Behold, I send the Promise of My Father upon you; but tarry in the city of Jerusalem until you are endued with power from on high.”