The Torah reveals that the very first “priest” (i.e., kohen: כּהֵן) was neither a Jew nor a Levite nor a descendant of Aaron, but rather Someone who is said to have “neither beginning of days nor end of life” but is made like (ἀφωμοιωμένος) the Son of God, a priest continually (Heb. 7:3). This priest, of course, was Malki-Tzedek (מַלְכִּי־צֶדֶק), the King of Salem (מֶלֶךְ שָׁלֵם) to whom Abraham offered tithes after his victory over the kings (Gen. 14:18). The author of the Book of Hebrews makes the point that the priesthood of Malki-Tzedek is greater than the Levitical priesthood and is therefore superior to the rites and services of the Tabernacle (Heb. 7:9-11). It was to Malki-Tzedek that Abram (and by extension, the Levitical system instituted by his descendant Moses) gave tithes and homage — and rightly so, since Yeshua is the great High Priest of the ultimate covenant based on God’s eternal life (Heb. 8:6).
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For more on this subject, see the article, “Exploring the Identity of Malki-Tzedek.”