What does the Bible say about the high priesthood of Jesus?

According to Hebrews 8:1-6, Jesus is described as the High Priest seated at the right hand of God, mediating for His people. Unlike the Levitical priests, whose role was a mere shadow of the true reality, Christ's priesthood is after the order of Melchizedek, offering Himself as the ultimate sacrifice for sin. His priestly work is unique in that He not only mediates between God and humanity but also perfectly fulfills the law and pays the penalty for sin through His death and resurrection. This indicates that the Old Testament sacrificial system was a mere metaphor that pointed to the reality found in Christ.