How does the Old Testament relate to the New Covenant?

The Old Testament serves as a foundational revelation of God's redemptive plan, culminating in the New Covenant instituted by Jesus Christ. The allegories, types, and prophecies found within the Old Testament highlight God's intentions and promises for salvation. For example, the covenant with Abraham and the law given at Sinai serve to illustrate the necessity of a Savior, which is fully realized in Christ. As the New Testament unfolds, it clarifies that Christ fulfills the Old Covenant and establishes a new way of grace, thus uniting all believers under one divine promise.