As Christians, we know Jesus was appointed by God to be the mediator between God and man. We know of His compassionate ministry. And we know that He offered Himself as a sacrifice for sins.
But what we might not appreciate is the fact that these are the aspects of the ministry of a high priest. To a Hebrew, certain questions would come up with claims of a new high priest. Questions like:
When was he appointed by God? How can he have compassion on those to who he ministers? What sacrifice does he offer to God on your behalf?
In the letter of Hebrews to the Hebrews, the writer understood these questions and how Jesus uniquely fulfilled the qualifications of the High Priest. So beginning in chapter 5, we see proof from the Scriptures that Jesus is not only a high priest, but the Great High Priest with a ministry superior and preferable to the ministry of the high priest under the Old Covenant.