In the beginning was the Word, and the Word was with God, and the Word was God.
John 1:1

God’s counsel and purpose for man was fulfilled in Christ. Jesus is the word of God; He is the one of whom God spoke in the law and prophets.

He Himself testified this: “Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me”.
John 5:39

The prophecies about the Messiah to come were given and recorded in scripture in such a detailed manner that when Herod sought to kill Jesus at His birth, and he inquired where Jesus was born, they replied:

“And they said unto him, In Bethlehem of Judaea: for thus it is written by the prophet”
Matthew 2:5.

The nature of His birth, His life on earth, and His redemptive work were all foretold. In fact the book of Matthew is a compendium of prophecies fulfilled in Christ Jesus. (Matthew 1:21-23; 2:13-15; 2:16-18; 2:23).

In a remarkable ‘bible study’ Jesus had after His resurrection, the bible says:
“And beginning at Moses and all the prophets, he expounded unto them in all the scriptures the things concerning himself”
Luke 24:27.

So, you can teach about Jesus from the Old Testament. This goes to prove that He is not ‘a subject’, He is ‘the subject’. The scriptures are meant to be about Him.

Our teachings today shouldn’t be any different. They must be christocentric (Christ centered). If our teachings do not help people understand who Christ is and what He has done, we have wasted our time.