Ask · Scripture & How We Got It

What is the difference between the Old and New Testaments?

The short answer

The difference is covenant, not importance or truth: the Old Testament records God's old covenant with Israel, with its law, sacrifices, and promises, while the New Testament records the new covenant Jesus established, in which those promises are fulfilled. The word testament itself is the older English word for covenant, a binding agreement God makes and keeps.

The fuller answer

Testament is covenant language. When Jeremiah prophesied in Israel's darkest days, God promised a new covenant unlike the one made at Sinai, marked by the law written on hearts, direct knowledge of God, and complete forgiveness of sins. The Old Testament therefore does not end in failure. It ends in expectation, with its own prophets announcing that God would one day do something new that the old arrangements pictured but could not complete.

Hebrews chapter 8 takes up Jeremiah's promise and argues that Jesus, as mediator of a better covenant built on better promises, has made the first covenant obsolete in its role as the church's rule of life. The sacrifices, priesthood, food laws, and land promises served as shadows and tutors. Christians still read the Old Testament as Scripture, as Jesus and the apostles did, while obeying it through Christ, in whom its patterns reach their goal. That is why Christians call the whole Bible one book in two testaments, reading the first with gratitude and expectation and the second with recognition, rather than discarding either half.

Jesus gave the whole Bible its map on the Emmaus road and after: the Law, the Prophets, and the Psalms all speak of him, and at the Last Supper he called the cup the new covenant in his blood, using the language of Matthew's account. One God, one plan, two covenant administrations. The Old Testament is promise and preparation, the New is fulfilment and proclamation, and neither can be understood properly without the other.

For daily reading, the distinction works like this. Read the Old Testament expecting promise, pattern, and preparation, and let the New Testament tell you how each thread lands in Christ, rather than applying every command to the church unfiltered. Read the New Testament expecting fulfilment that sends you back, since its pages quote the Old on nearly every leaf. The covenants differ in administration, glory, and permanence, as Paul and Hebrews insist, yet the God who made both is the same, and his character, mercy, holiness, and faithfulness never change between the testaments.

Sources

• Berean Standard Bible (BSB)

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