Hebrews 5:6

He is here called simply "Priest"; in Heb 5:5, "High Priest." He is a Priest absolutely, because He stands alone in that character without an equal. He is "High Priest" in respect of the Aaronic type, and also in respect to us, whom He has made priests by throwing open to us access to God [BENGEL]. "The order of Melchisedec" is explained in Heb 7:15, "the similitude of Melchisedec." The priesthood is similarly combined with His kingly office in Zac 6:13. Melchisedec was at once man, priest, and king. Paul's selecting as the type of Christ one not of the stock of Abraham, on which the Jews prided themselves, is an intimation of Messianic universalism.

In this chapter the apostle continues his discourse upon the priesthood of Christ, a sweet subject, which he would not too soon dismiss. And here, I. He explains the nature of the priestly office in general (Heb 5:1-3). II. The proper and regular call there must be to this office (Heb 5:4-6). III. The requisite qualifications for the work (Heb 5:7-9). IV. The peculiar order of the priesthood of Christ; it was not after the order of Aaron, but of Melchisedec (Heb 5:6, Heb 5:7, Heb 5:10). V. He reproves the Hebrews, that they had not made those improvements in knowledge which might have made them capable of looking into the more abstruse and mysterious parts of scripture (Heb 5:11-14).