How do we know that Jesus is the mediator of the new covenant?

The epistle to the Hebrews consistently presents Jesus as the mediator of the new covenant, and Hebrews 12:24 explicitly states this truth. In this context, the 'new covenant' entails a relationship characterized by grace and unconditional acceptance by God, in stark contrast to the old covenant which was based on the law. Jesus' role as mediator is crucial because His sacrificial death—symbolized by the blood of sprinkling—provides the atonement necessary for reconciling sinners to God. Unlike the sacrifices of old that could not cleanse from sin, Christ's blood speaks of peace and acceptance, securing our relationship with God for all eternity. The assurance of our salvation is rooted in His completed work on the cross, which fulfills the requirements of the law and offers a path to true fellowship with God.