What are the main differences between the old testament and the new testament?

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). The Old Testament prophecies related to the coming of Christ, although incredibly detailed, contain a certain amount of ambiguity that is cleared up in the New Testament.

For example, the prophet Isaiah spoke of the death of the Messiah (Isaiah 53) and the establishing of the Messiah’s kingdom (Isaiah 26) with no clues concerning the chronology of the two events—no hints that the suffering and the kingdom-building might be separated by millennia. In the New Testament, it becomes clear that the Messiah would have two advents: in the first He suffered and died (and rose again), and in the second He will establish His kingdom. Because God’s revelation in Scripture is progressive, the New Testament brings into sharper focus principles that were introduced in the Old Testament.

The book of Hebrews describes how Jesus is the true High Priest and how His one sacrifice replaces all previous sacrifices, which were mere foreshadowings. The Passover lamb of the Old Testament (Ezra 6:20) becomes the Lamb of God in the New Testament (John 1:29). The Old Testament gives the Law.

The New Testament clarifies that the Law was meant to show men their need of salvation and was never intended to be the means of salvation (Romans 3:19). The Old Testament saw paradise lost for Adam; the New Testament shows how paradise is regained through the second Adam (Christ). The Old Testament declares that man was separated from God through sin (Genesis 3), and the New Testament declares that man can be restored in his relationship to God (Romans 3—6).

The Old Testament predicted the Messiah’s life. The Gospels record Jesus’ life, and the Epistles interpret His life and how we are to respond to all He has done. In summary, the Old Testament lays the foundation for the coming of the Messiah who would sacrifice Himself for the sins of the world (1 John 2:2).

The New Testament records the ministry of Jesus Christ and then looks back on what He did and how we are to respond. Both testaments reveal the same holy, merciful, and righteous God who condemns sin but desires to save sinners through an atoning sacrifice. In both testaments, God reveals Himself to us and shows us how we are to come to Him through faith (Genesis 15:6; Ephesians 2:8).

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