“And beginning with Moses and all the Prophets, he explained to them what was said in all the Scriptures concerning himself.”  . . .

“He said to them, ‘This is what I told you while I was still with you: Everything must be fulfilled that is written about me in the Law of Moses, the Prophets and the Psalms.’” ~ Luke 24:10, 44

The Bible comes in 3 major parts:
(1) The Gospel Implied: The Old Testament
(2) The Gospel Supplied: Matthew, Mark, Luke and John
and
(3) The Gospel Applied: = the New Testament – (Matthew, Mark, Luke and John)

re: (1) What I am referring to by the Gospel Implied is the Old Testament is that the Gospel is implicitly present in the Old Testament. The OT consists of numerous Gospel-Sightings. These come in the form of types, figures, shadows, foreshadows, ceremonies, sacrifices, prophecies about the coming Messiah, Messianic Psalms, etc.

So whether Melchizedek in Genesis, or the Shepherd-King in Song of Songs, or the coming Messenger of the covenant in Malachi—Jesus is implicitly present. The All in All is truly in All in All.

re: (2) By Gospel Supplied I am referring to Matthew, Mark, Luke, and John. This is the life, death and resurrection of . . .

re: (3) By Gospel Applied I am referring to all of the NT books sans the Gospel accounts. I think that we can think of these books/letters as being amplifications, commentaries, expositions, illustrations, explanations … of the Gospel.