Why we preach Christ from the Old Testament

“You must preach the text as it lays,” someone said to Jared Wilson.
“Indeed,” replied Jared, “and every OT text lays, as Spurgeon put it, ‘along the road to Christ.’”
In support of his assertion, Jared points to the following New Testament texts:
John 5:39 — “You search the Scriptures because you think that in them you have eternal life; and it is they that bear witness about me”
John 8:56 — “Your father Abraham rejoiced that he would see my day. He saw it and was glad.”
Luke 24:27 — “And beginning with Moses and all the Prophets, he interpreted to them in all the Scriptures the things concerning himself.”
Acts 2:14-28 — The first Christian sermon, Peter’s at Pentecost, is essentially a Christ-centered exposition of Joel 2 and Psalm 16.
Romans 15:4 — “For whatever was written in former days was written for our instruction, that through endurance and through the encouragement of the Scriptures we might have hope.”
1 Corinthians 15:3-4 — “For I delivered to you as of first importance what I also received: that Christ died for our sins in accordance with the Scriptures, that he was buried, that he was raised on the third day in accordance with the Scriptures.”
2 Corinthians 1:20 — “For all the promises of God find their Yes in him. That is why it is through him that we utter our Amen to God for his glory.”
Galatians 3:24-25 — “So then, the law was our guardian until Christ came, in order that we might be justified by faith. But now that faith has come, we are no longer under a guardian”
The entire book of Hebrews
‘The truth is,’ (Jared concludes) ‘the entire New Testament—from the Gospels to Revelation—is full of the fulfillment of Old Testament texts in the person and work of Christ. The Old Testament is Christian Scripture.’