Sharing today from Got Questions?
Answer: While the Bible is a unified book, there are differences between the Old Testament and the New Testament. In many ways, they are complementary. The Old Testament is foundational; the New Testament builds on that foundation with further revelation from God. The Old Testament establishes principles that are seen to be illustrative of New Testament truths. The Old Testament contains many prophecies that are fulfilled in the New. The Old Testament provides the history of a people; the New Testament focus is on a Person. The Old Testament shows the wrath of God against sin (with glimpses of His grace); the New Testament shows the grace of God toward sinners (with glimpses of His wrath).
The Old Testament predicts a Messiah (see Isaiah 53), and the New Testament reveals who the Messiah is (John 4:25–26). The Old Testament records the giving of God’s Law, and the New Testament shows how Jesus the Messiah fulfilled that Law (Matthew 5:17; Hebrews 10:9). In the Old Testament, God’s dealings are mainly with His chosen people, the Jews; in the New Testament, God’s dealings are mainly with His church (Matthew 16:18). Physical blessings promised under the Old Covenant (Deuteronomy 29:9) give way to spiritual blessings under the New Covenant (Ephesians 1:3).