Hebrews 9 discusses the old and new covenants between God and his people. The author explains that in the old covenant, priests had to continually offer sacrifices for sins, but Christ came as a high priest to offer himself as a perfect sacrifice once and for all. The writer also emphasizes the need for blood to be shed for forgiveness of sins and touches on the importance of Christ's resurrection. The chapter concludes with the idea that Christ's sacrifice frees us from the bondage of sin and allows us to serve God fully.