Which book addresses how much more the blood of Christ can purify compared to sacrifices of the Old Covenant?

The book of Hebrews is specifically focused on the superiority of Christ and His sacrificial work, particularly in contrast to the sacrifices made under the Old Covenant. Throughout Hebrews, the author emphasizes how Christ's blood offers a far greater purification and atonement for sin than the animal sacrifices that were part of the Mosaic law. This theme is notably articulated in Hebrews 9:11-14, where it is explained that the blood of Christ, through His eternal Spirit, cleanses believers from dead works to serve the living God.

This focus on the efficacy of Christ's sacrifice is central to the theological message of Hebrews, making it clear that the New Covenant established by Jesus provides a deeper and more effective means of purification and reconciliation with God than was possible under the Old Covenant. Other books listed, while important in their own right, either do not address this issue directly or focus on different aspects of Christian teaching and practice.