Jason DeRouchie: If Christians are part of the new covenant, why should we seek to understand and apply the Old Testament (OT)? I’ll give 10 reasons why the first word in the phrase Old Testament must not mean unimportant or insignificant to Christians. 1. The OT was Jesus’s only Scripture and makes up three-fourths (75.55 percent) of our Bible. If space says anything, the OT matters to God, who gave us his Word in a book. In fact, it was his first special revelation, which set a foundation for the fulfillment we find in Jesus in the New Testament (NT). The OT was the only Bible of Jesus and the earliest church (e.g., Matt. 5:17; Luke 24:44; Acts 24:14; 2 Tim. 3:15), and it’s a major part of our Scriptures. 2. The OT substantially influences our understanding of key biblical teachings. By the end of the Law (Genesis–Deuteronomy), the Bible has already described or alluded to all five of the major covenants that guide Scripture’s plot
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