The truth of Jesus as our High Priest is established through Scripture, particularly in the book of Hebrews.
The book of Hebrews builds a strong case for Jesus being our High Priest by contrasting Him with the Levitical priesthood. Hebrews 7:3 states that Melchizedek has neither beginning of days nor end of life, symbolizing Christ's eternal priesthood. Furthermore, the author cites prophetic scripture, such as Psalm 110:4, to affirm that God appointed Jesus as a priest after the order of Melchizedek, thus ensuring that our understanding of Christ's priestly role is firmly anchored in God's eternal purpose.
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