How does the blood of Christ secure our salvation?

The sacrificial death of Christ, as stated in Hebrews 12:24, is central to the gospel and our salvation. His blood serves as the definitive atonement for the sins of His people, effectively cleansing them from all unrighteousness. Unlike the Old Testament sacrifices which were only temporary, Christ's sacrifice is once for all time, establishing our justification. The blood signifies His fulfilling of justice and the establishment of a new covenant where believers are promised eternal life and righteousness. Thus, through the atoning work of Christ, we are assured of our standing before God and our place in the heavenly Jerusalem.