If you enjoy a challenge, I recommend this book: Mind the Gap: How the Jewish Writings between the Old and New Testament Help Us Understand Jesus, by Matthias Henze. Fortress Press.
One example from the book:
While there are several individuals in the Bible who are said to be anointed, the word “messiah” or “anointed one” is never used in the Old Testament to designate a future anointed redeemer figure.
In other words, there are no texts in the Old Testament that know of the concept of a messiah as an awaited agent of God, a descendant of David who will appear to reign over a restored kingdom of Israel at the end of time. That concept of a future messiah was only developed in later times, after the Old Testament.
There are several “messiahs” in the Old Testament, to be sure, but they are not divine figures of the end of time. They are the kings, priests, and prophets of ancient Israel.
And yet, when Andrew tells his brother Simon Peter, “We have found the Messiah,” or when the Samaritan woman declares, “I know that the Messiah is coming,” they are not referring to an earthly king, priest, or prophet. They are expressing the hope for a future redeemer figure, the messiah of the end time. We find that concept develop in the literature that was written during the gap years in between the Old and the New Testament.
There are no texts in the Old Testament that speak of a future messianic
figure of the end time. (Henze, pages 58-59)