What role does Jesus Christ play in the new covenant?

In the new covenant, Jesus Christ fulfills multiple roles: He is the testator whose death secures the inheritance for His elect, and He also acts as the executor, ensuring that the promises are applied to believers. The significance of these roles illustrates the completeness of Christ’s work; He not only established the covenant through His sacrifice but also guarantees its application through His resurrection and continued intercession for His people. This means that all who are in Christ can rest assured that they are secure in the blessings of the new covenant, as He directly administers it.