How do we know Jesus is a priest like Melchizedek?

The book of Hebrews articulates Jesus' priesthood as being in the order of Melchizedek, distinctive from the Aaronic priesthood. Melchizedek is described as having neither beginning nor end, similar to Christ who is eternal. This comparison emphasizes that Jesus' priesthood is superior because it is based on the power of an endless life rather than a temporal lineage. Melchizedek's encounter with Abraham and the absence of a genealogical record serve to illustrate the uniqueness and superiority of Christ's priesthood, which fulfills and transcends the Old Testament priestly system.