This is what is giving me cause for thought:
Hebrews 7:14 For it is evident that our Lord was descended from Judah, a tribe with reference to which Moses spoke nothing concerning priests.
The passage above is discussing the seeming mystery that exists between Melchisedec the king of Salem/peace , the Levitical priesthood or descendants of Aaron, and our Lord Jesus, who was made priest after the fashion of Melchisedec.
Here is what I see in this matter.
Melchisedec
the king of Salem ... is an eternal being ... having no mother or father ... but is the one who receives the tithe and is able to bestow blessings as well.
The descendants of Aaron, who were appointed priest much later ... are said to have paid tithes to King Melchisedec because at the time of Abraham paying his tithe to Melchisedec ... Levi their Father was within the loins (within the genetic pool of potential) of father Abraham.
Yet in I Samuel a remarkable prophesy was given unto Eli the high priest ... a son of Aaron that things were going to change.
Watch:
I Samuel 2:27-36 KJV (I will paraphrase for time, but you read it all for yourself.)
A prophet of God relayed the LORD God's words to Priest Eli:
"Did I (the LORD) plainly appear unto the house of thy father (Aaron), when they were in Egypt in Pharaoh's house?And did I choose him out of all the tribes of Israel to be my priest...
Wherefore kick ye at (IOW, why do you disrespect) my sacrifice and at mine offering?"
Wherefore the LORD God of Israel saith:
"I said indeed that your house (Eli's house), and the house of thy father (the house of Aaron of Levi); should walk before me for ever ...
BUT (notice that the word 'but' means an important CHANGE IS COMING) ... BUT NOW the LORD says:
"Be it far from Me; because them that honor me I will honor, and they that despise me shall be lightly esteemed."
Did you notice that change that was coming? Now, we know that the literal priesthood continued ... even after King Saul murdered most of them... yet a remnant of them remained and even in King David's day there were priests left of the lineage of Aaron still around.
Now, back to I Samuel 2:31-36 KJV (God is still speaking to Priest Eli through the prophet)
"Behold, the days come, that I will cut off your arm (authority), and the arm (authority) of thy father's house (Aaron), that there shall not be an old man in your house.
You will see an enemy in your habitation... and the man who I shall not cut off ... shall be (the one) to consume your eyes, and grieve your heart: All the increase of your house shall die in their youth. And this will be your sign that this has begun ... when your son's (Eli), both Hophni and Phinehas die on the same day.
AND THEN (here comes the future prophesy) I (the LORD) will raise me up
a faithful priest, that
shall do according to that which is in mine heart and in my mind: and I will build
him a sure house; and
he shall walk before mine anointed for ever.
And it shall come to pass, that every one that is left in your house (Levi, Aaron, through Eli) shall come and crouch
to him for a piece of silver and a morsel of bread, and shall say, 'Put me, I pray thee, into one of the priests' offices, that I may eat a piece of bread."
The next chapter shows how God introduced himself to the young lad Samuel... a chosen prophet and priest after Eli and his sons.
You see, God began respecting individuals who respected him from that point forward ... and not just respecting those who were descendants of Aaron.
I believe that this prophesy found within I Samuel 2 was pointing to our Savior Jesus Christ, who would one day
be raised up to an
eternal position as a high priest after the likeness of Melchisedec... having no earthly mother or father ... but being God himself come as his own Son.
I am prone to believe that Abraham called the LORD by the name of
Melchisedec, the king of Salem ... because Abraham did not know the name of the ONE God who appeared to him. Exodus 6:3 KJV Abraham just knew that it was God who had blessed him in the battle he had just won ... and that it was to HIM the tithe was due. Obviously Melchisedec was the ONE who was able to bless Abraham ... and he administered the sacraments to Abraham at that meeting.
Genesis 14:18 KJV.
Well, if Melchisedec, was God, the KING and his own High Priest ... then our LORD Jesus, as God, destined to reign as our risen king, is as well the perfect match for the eternal high priest to be raised up.
After all, our Lord Jesus told us that he only did and said what was in God's heart and mind while he was on earth.
I hope I got the point across well ... there is so much that can be said about this matter.