It is clear you have the wrong idea about the scriptures.
Yes, Peter gave credit to God for the voice of Christ the Word. But Jesus, though He referred to the scriptures many times, made clarification that His "words are spirit"...which many now and as it was then, will not hear, referring back to the scriptures, rather than to the very voice of Him who inspired their writing.
Which is greater?
But whether by the scriptures or by discernment of the spirit of God, either way, what is written was not to be the end of the matter. The end of the matter is written also, and so there should be no room for debate: In the end what was once written by the scribes on parchment is made complete by God Himself writing them on our hearts, not with ink, but with His own hand...which is spirit.
So, we have heard and read it from the prophets, from the mouth of Christ, and also from the apostle Paul, the apostle for these times of the gentiles wherein God has promised to pour out His spirit upon all flesh.
The question that all should be asking, is: Who are these who refuse to go along with the great plan of God to finish in the spirit, what He has begun in the flesh, just as it is written? And who are these who hear their voices, instead of His?
This too is written.