In defining the dignity of this new hope, or, as the Apostle later says, covenant, he directs attention to the Minister of this covenant or union.
The Old Testament priests were appointed to their ministry without receiving oath-bound assurance that the priesthood would remain forever in their lineage. But concerning the New Testament High Priest, God swore that He would be High Priest forever.
Therefore Jesus serves a better covenant (cf. 7:19), a more reliable union, and even becomes its surety. That is, He guarantees that the conditions of the covenant will be kept holy by both sides.
Moses and the Old Testament priests could not say this. Jesus guarantees it by the very fact that in Him we already see the conditions of the union fulfilled, both on God’s side and on man’s.
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For He was crowned by God with glory and honor for His complete obedience, according to His humanity, to the will of God.
Thus the meaning of the New Covenant is measured by the priesthood of the Old Covenant. Christ, whom God swore to preserve as High Priest forever, also exalts the covenant for which He serves as surety.