How do we know that Jesus is a high priest after the order of Melchizedek?

The Bible confirms Jesus' priesthood after the order of Melchizedek through several passages in Hebrews, particularly in Hebrews 5:10 and 7:17. This order is characterized by an eternal priesthood, unbounded by human limitations such as sin and mortality, unlike the Levitical priests. God swears an oath regarding Jesus' eternal priesthood, establishing Him as a superior mediator who offers the better hope stemming from His perfection and ability to save to the uttermost those who come to God through Him.