The biblical-theological pattern by which the Old Testament promises are fulfilled in the New Testament in the person and work of Christ. The pattern is the structural relationship between the testaments in covenant theology and Reformed biblical theology, expressing the substantive unity of redemptive history while honoring its genuine progression. The OT is the era of promise: the protoevangelium (the first gospel-promise, Genesis 3:15, the seed of the woman who will crush the serpent's head); the Abrahamic promises (the seed, the land, the blessing to all nations, Genesis 12:1-3; 15; 17); the Davidic promises (the everlasting throne, the son who will reign forever, 2 Samuel 7); the prophetic promises (the new covenant, Jeremiah 31:31-34; the suffering servant, Isaiah 53; the coming Messiah, the outpoured Spirit, the gathered nations). The NT is the era of fulfillment: all the promises of God in him are yea, and in him Amen (2 Corinthians 1:20); Christ is the fulfillment of the law and the prophets (Matthew 5:17); the gospel is the promise made to the fathers now fulfilled (Acts 13:32-33); Christ is the seed of the woman, the seed of Abraham (Galatians 3:16), the son of David (Matthew 1:1), the suffering servant, the mediator of the new covenant (Hebrews 8-9). The substantive interpretive principle: the OT promises are not abandoned, spiritualized away, or fulfilled in a different program (the dispensational error) but are genuinely fulfilled in Christ and His church, often in ways that exceed and transform the original form of the promise (the land promise fulfilled in the new creation; the throne promise fulfilled in Christ's heavenly reign; the seed promise fulfilled in Christ and those in Him). The patriarchal-Reformed reader holds the substantive promise-and-fulfillment pattern as the key to reading the two testaments together: the OT promises, the NT fulfills; the whole of Scripture is the unfolding of the one redemptive plan climaxing in Christ.