How do we know Jesus' priesthood is superior to the Levitical priesthood?

Hebrews 7 contrasts the Levitical priesthood with that of Jesus, emphasizing that the Levitical priests were made without an oath and had to be replaced due to mortality. In contrast, Jesus is made a High Priest with an oath from God, which underlines the permanence of His priesthood. This oath states that Jesus is a priest forever after the order of Melchizedek, indicating that His priesthood is both eternal and superior. The Levitical system could not provide true perfection or salvation, while Jesus, being both God and man, offers a better hope through His perfect sacrifice.