Concerning the greatness of Melchisedec, after whose order Christ is a high priest, Heb 7:1-4. The Levites had authority to take tithes of the people; yet Abraham, their representative, paid tithes to Melchisedec, Heb 7:5-10. Perfection cannot come by the Mosaic law, else there could be no need for another priest after the order of Melchisedec, according to the prediction of David in Psa 110:1-7, which priest is sprung from a tribe to which the priesthood, according to the law, did not appertain; but Christ is a priest for ever, not according to the law, but after the order of an endless life, Heb 7:11-17. The law, therefore, is disannulled, because of its unprofitableness and imperfection; and Christ has an unchangeable priesthood, Heb 7:18-24. He is therefore able always to save them that come unto him, being in every respect a suitable Savior; and he has offered up himself for the sins of the people, Heb 7:25-27. The law makes those priests who have infirmity; but he who is consecrated by the oath is perfect, and endures for ever, Heb 7:28.
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For this Melchisedec, king of Salem - See the whole of this history largely explained in the notes, See Gen 14:18 (note), etc., and the concluding observations at the end of that chapter.
The name Melchisedec, מלכי צדק is thus expounded in Bereshith Rabba, sec. 43, fol. 42, מצדיק את יושביו matsdie eth Yoshebaiv, "The Justifier of those who dwell in him;" and this is sufficiently true of Christ, but false of Jerusalem, to which the rabbins apply it, who state that it was originally called Tsedek, and that it justified its inhabitants.
Salem is generally understood to be Jerusalem; but some think that it was that city of Shechem mentioned Jos 20:7. St. Jerome was of this opinion.