You search the Scriptures because you think that in them you have eternal life, and it is they that bear witness about me. John 5:39
Specifically, there are three crucial reasons why the Old Testament should be part of your daily reading:
1. A deeper understanding of God. Sometimes God specifically mentions himself, while his sovereignty and divine plan are always at work. The Old Testament offers beautiful windows into who God is, his character and his glory. It gives awareness of him, what he is about, what he focuses on. Most importantly, his holiness is defined and described.
2. A deeper understanding about you. The Old Testament provides a clear picture for whats wrong with the human condition. The first half of the Bible is not a collection of stories with moral lessons. They give insight into your complete helplessness and inability to save yourself.
3. A deeper understanding of your need for God. Page after page pictures are given to the progressive revelation of Gods great plan of salvation. The Old Testament describes the overwhelming dilemma all people are in, and points to a savior to rescue us. It says only Jesus Christ will save you.
Jesus says in 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. He was talking to folks who read and studied the Old Testament, yet they completely missed him.
The Old Testament then is a window to your great need for Jesus Christ. It tells the story that finds its end in him alone. Every story is an image, a metaphor, a comparison or analogy, that provides deeper understanding of Jesus and your great need of him.
So, read the Old Testament, look for Jesus, and be in awe of him and his worth