The term ‘Melkizedeq Priesthood’ does not directly appear in the Torah, TaNaK, or the NT (the rest of the Bible). This being so; being as it may, it is nonetheless heavily alluded to.
The term ‘priesthood’ – comes from the Hebrew H3550 <kehu^nna^h>, Remember all the 60’s surfer lingo – ‘The Big Kahuna’ ? Who knew? The term ‘priest’ comes from the Hebrew H3548 <Kohen>. Priesthood is first directly expressed biblically at Ex.40:15Ex.40:15 And thou shalt anoint them, as thou didst anoint their father, that they may minister unto me in the priest’s office: for their anointing shall surely be an everlasting priesthood throughout their generations.
However; Priesthood is indirectly inferred at Ex.19:5-6
Ex.19:5 Now therefore, if ye will obey my voice indeed, and keep my covenant, then ye shall be a peculiar treasure unto me above all people: for all the earth is mine: :6 And ye shall be unto me a kingdom of priests, and an holy nation…
The phrase ‘kingdom of priests’ definitely bespeaks of a specific priest grouping. This priest-group or ‘hood’ can be none other than the ‘Melkizedeq Priesthood’. For this ‘kingdom of priests’ was to all 12 Tribes of Israel not just the Levities. No one had ever heard of a Levite tribe only priesthood at that point.
The Israelites said ‘Oh yeah – we’ll keep the covenant’ (Ex.19:7-8 / 24:7-8) – BUT they did not – they broke the covenant within 40 days (Ex.32). YHWH was going to destroy them all; wipe them all out, including Aaron and his sons – except Moses.
Ex 32:10 Now therefore let me (YHWH v:9) alone, that my wrath may wax hot against them, and that I may consume them (Israel v:9): and I will make of thee (Moses v:9) a great nation.
But Moses pleaded for the people – YHWH relented (Ex.32:14) – BUT; now they were no longer eligible to be that nation **of ‘Melkizedeq’ Priests – They would now be a nation **with Levitical priests; thrust under the Levitical priesthood; the Levitical priesthood was born.
Num 3:12 And I, behold, I have taken the Levites from among the children of Israel instead of all (from every tribe) the firstborn (Ex.13:2) that openeth the matrix among the children of Israel: therefore the Levites shall be mine; (Num.8:14)
The term ‘the Levitical Priesthood’ does occur 1 time in the entire Bible at Heb.7:11
Heb 7:11 If therefore perfection were by the Levitical priesthood, (for under it the people received the law,)…
The Levitical priesthood was a closed priesthood reserved for Levites. But we who have accepted Yahshua as Messiah (the Melkizedeq High Priest – Heb.4; 5; 6; 7; 8; 9; 10) are being called back into the original Ex.19 Melkizedeq Priesthood.
1Ptr.2:9 But ye are a chosen generation, a royalG934 priesthood,G2406, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light:
From G935; kingly (in nature): – royal.
Probably from G939 (through the notion of a foundation of power); a sovereign (abstractly, relatively or figuratively): – king.
From G2407; the priestly fraternity, that is, a sacerdotal order (figuratively): – priesthood.
Prolongation from G2409; to be a priest, that is, perform his functions: – execute the priest’s office.
King in Hebrew is ‘Melek’ – ‘Zedek’ in Hebrew means ‘Righteous’; ergo the Melkizedeq Priesthood – or the King’s Righteous Priest Order (i.e. royal priesthood 1Ptr.2:9)