How can Jesus be our great high priest if he is from the tribe of Judah rather than the tribe of Levi? The writer of Hebrews quotes Psalm 110 and explains that Jesus is a better high priest, because unlike mere mortal men, he is unstained by sin and unconstrained by death. Additionally, while the earthly high priest had to enter the most holy place in the tabernacle year after year, Jesus has entered the heavens and is seated at the right hand of God Most High, his sacrifice finished once and for all. As a side note, if you’d like a refresher on the original account of Melchizedek, you can go back and listen to Genesis 14, found in episode 4 of Commuter Bible.