What is the role of Christ in the covenant?

In the context of the covenant, Christ acts as the mediator who establishes the terms under which God and humanity relate. As prophesied in Isaiah 42:6, He was sent to fulfill God’s righteousness and to serve as a light to the nations. Christ’s role includes being the high priest who offers Himself as the ultimate sacrifice for sin, effectively securing our justification (Hebrews 9:15). Having endured temptation yet remained sinless, He fully embodies what it means to fulfill the law and receive God's approval on our behalf. Consequently, Christians are united to Him and receive the benefits of the covenant through faith, assuring us of our acceptance before God.