How does the New Testament affirm the Old Testament promises?

The New Testament reflects the continuity of God's promises made in the Old Testament, as seen in the fulfillment of prophecies concerning Christ's coming and work. Zacharias' proclamation in Luke reveals not only the fulfillment of the birth of John the Baptist as a precursor to Christ but also acknowledges Christ as the culmination of God's plan for redemption. By asserting that God continually fulfills His word through Jesus, the New Testament depicts Christ as the divine guarantee of all Old Testament promises, thus establishing the unity of Scripture and the faithfulness of God to His people.