MELCHIZ' EDEK, WHO IS HE?

Melchiz'edek is mentioned in the Scriptures in conjunction with priesthood. In Genesis 14 an alliance of  Four Eastern Kings is mentioned, subjugating Five Cities of the Jordan Valley and the subsequent liberation of the cities by Abram. Following Abram's victory, Melchiz'edek approaches him with bread and wine and pronounces a blessing upon him.
The name Mechiz'edek means "King of Righteousness." As King of ancient Salem and "Priest of the Most High God," he is the first priest mentioned in the Scriptures.
Being the King of Salem, which means "King of the City of Peace," Melchiz'edek is identified by the apostle Paul as "King of Peace," and, on the basis of his name, as "King of Righteousness."
Hebrew 7 -For this Melchiz'edek, King of Salem, priest of the Most High God, who met Abraham returning from the slaughter of the kings, and blessed him; to whom also Abraham gave a tenth part of all; first being that by interpretation (translation) of his name is King of Righteousness, and after that, also King of Salem, which is King of Peace.
Melchidekek is without father, without mother, without descent, having neither beginning of days, nor end of life; but made like (resembling) the Son of God; he continues a priest for ever.
Now consider how great this man is, unto whom even the patriarch Abraham gave the tenth of the spoils. And those descendants that are of the sons of Levi, who receive the office of the priesthood, have a commandment to take the tithes of the people according to the Law, that is of their brethren, though they come out of the loins of Abraham (these also are descended from Abraham).
But Melchizedek whose descent is not counted from them, received tithes of Abraham, and blessed him that had promises. It is beyond dispute, without all contradiction, that the inferior is blessed by the superior, the less is blessed of the better.
Here tithes are received by mortal men (men that die); there, by one of whom it is testified that he lives.
One might even say that Levi himself, who receives tithes, paid tithes through Abraham, for he was still in the loins of his ancestor when Melchiz'edek met him.
If therefore perfection had been attained through the Levitical priesthood (for under it the people received the Law), what further need would there have been for another priest to arise after the order of Melchiz'edek, rather than one named after the order of Aaron?
For when there is a change in the priesthood, there is necessarily a change in the Law as well. For the one of whom these things are spoken belonged to another tribe, from which no man gave attendance at the altar. For it is evident that our Lord sprang out of Judah; and Moses said nothing about priests in connection with that tribe.
And it is yet far more evident when another priest arises in the likeness of Melchiz'edek, who has become a priest, not after the Law of a carnal commandment, but after the power of an endless life. For it is witnessed of him, "You are a priest forever, after the order of Melchiz'edek."
On the one hand, a former commandment is set aside because of its weakness and uselessness (for the Law made nothing perfect); on the other hand, a better Hope is introduced, through which we draw near to God. And it was not without an oath.
Those who formerly became priests took their office without an oath, but this one was addressed with an oath, "the Lord has sworn and will not change his mind, 'You are a priest for ever'" This make Jesus the surety of a better covenant.
The former priests were many in number, because they were prevented by death from continuing in office; but this man, Jesus, holds his priesthood permanently, because he continues for ever. Consequently he is able for all time to save those who draw near to God through him, since he always lives to make intercession for them.
For such a high priest he became to us, who is holy, harmless, undefiled, separate from sinners, and made higher that the heavens; who has no need, like those high priests, to offer sacrifices daily, first for his own sins and then for those of the people. He did this once for all when he offered up himself.
Indeed, the Law appoints men in their weakness as high priests, but the word of the oath, which came later than the Law, appoints a Son who is consecrated for ever.