THE SPIRIT CONFIRMS
Having received the man Jesus as their Messiah, Jews needed some special guidance and assurance about the command to "Hear Him!".
The New Testament letter to the Hebrew Believers was the Holy Spirit's way of doing that for them (and for all other Believers as well, of course).
In this letter the truths of Jesus, the New Covenant and the Kingdom are revealed and compared and contrasted to the Old Covenant.
The Spirit inspired the writer to start with this strong declaration:
"God, who at various times and in various ways spoke in time past to the fathers by the prophets, has in these last days spoken to us by His Son, Hebrews 1'1.
It is unmistakeable:
God spoke in time past to the fathers - by the prophets.
In these last days He speaks to us - by His Son.
These are history-making words. Someone reading them today might think that they make the Old Testament is irrelevant.
At the least this question arises: "What, then, is the place of the Old Testament?"