"Should you not know that the Lord,
the God of Israel, gave the kingdom to David over Israel forever,to him and to his sons, with a covenant of salt?" (2 Chronicles 13:5, Numbers 18:19). God made an eternal covenant of salt with Aaron and his descendants. And it is also written: "and David's sons were chief ministers" (priests, Hebrew: Cohanim) (2 Samuel 8:18, Exodus 19:4-6, Isaiah 61:6-11).

"For so said the Lord: There shall not be cut off from David a man sitting on the throne of the house of Israel. And of the Levitic priests, there shall not be cut off from before Me a man offering up a burnt offering, or burning a meal-offering or performing a sacrifice for all time" (Jeremiah 33:17-18, 1 Chronicles 23:13).

"So said the Lord of Hosts, saying: Behold a man whose name is the Shoot (his greatness burgeoned little by little), who will spring up out of his place (from royal descent) and build the Temple of the Lord. And he shall build the Temple of the Lord, and he shall bear glory (of the kingship). And he shall sit and rule on his throne, and the (High) priest shall be on his throne. And a counsel of peace shall be between them both" (Zechariah 6:12-13, Isaiah 11:1-5, Jeremiah 33:14-16, Genesis 37:3-10, 49:8-12, 22-26, Deuteronomy 33:7,13-17).

"Pinchas son of Elazar son of Aaron the Priest TURNED AWAY MY WRATH from upon the Children of Israel in his zealousness. THEREFORE SAY: I HEREBY GIVE HIM MY COVENANT OF PEACE" (Numbers 25:11-12). 
Pinchas' valor lay in standing up for what is right and true even though it flew in the face of the prevailing orthodoxy, and he was in mortal danger of getting lynched. Pinchas did not flinch from stating the Torah law, even when it was unpopular, and for this he was given G-d's Covenant of Peace" (Rabbi Avraham Greenbaum).

Numbers 25:13 "It shall be for him and for his descendants after him [as] an eternal covenant of kehunah (priesthood), BECAUSE HE WAS ZEALOUS FOR HIS GOD AND ATONED FOR THE CHILDREN OF ISRAEL." Pinchas saw...arose from the congregation, and took a spear in his hand...and he killed the Israelite man, and the Midianite woman...and the plague ceased from the children of Israel (Num. 25:6-8). Pinchas made it known, and he was the one to carry it out. And so, we learn in [Tractate] Zevachim [101b],“Phinehas was not made a kohen until he killed Zimri.”

The Hebrew for "atone" also means "cleanse." Pinchas INTERVENED to stop- not only the plague, bu t the immoral behavior of the people. He "cleansed" them and allowed them to be atoned for. In other words, he did not atone FOR THEM, but BROUGHT THEM TO A SITUATION OF ATONEMENT. Simply, the "covenant of peace" relates to a Kohen's role, which is one of peace (there are various rituals he performs which bring peace of mind to an individual, peace to a family etc., (Rabbi Shishler).

The word "atonement" can refer to leaving behind an inferior spiritual status and moving up to a higher one (Exodus 29:33).

Malachi 2:4-7, depict the behavior and attitudes that God asks from the priests by evoking the personality of the founding fathers of the priesthood, Aaron and Pinchas, with whom God also established His covenant (Numbers 25:12). " And you shall know that I have sent you this commandment, that My covenant be with Levi, says the Lord of Hosts. My covenant was with him, life and peace, and I gave them to him [with] fear; and he feared Me, and because of My Name, he was over-awed. True teaching was in his mouth, and injustice was not found on his lips. In peace and equity he went with Me, and he brought back many from iniquity (see Exodus 32:26). For a priest's lips shall guard knowledge, and teaching should be sought from his mouth, for he is a messenger of the Lord of Hosts." Only the Kohen Gadol may enter the Holy of Holies, where God's presence is manifest.

The Holy of Holies

http://www.aish.com/h/hh/yk/48953941.html

"And of Levi he said: "Your Tummim and Urim belong to Your pious man, whom You tested at Massah and whom You tried at the waters of Meribah, who said of his father and his mother, 'I do not see him'; neither did he recognize his brothers, nor did he know his children, for they observed Your word and kept Your covenant. They shall teach Your ordinances to Jacob, and Your Torah to Israel; they shall place incense before You, and burnt offerings upon Your altar. May the Lord bless his army and favorably accept the work of his hands; strike the loins of those who rise up against him and his enemies, so that they will not recover" (Deut. 33:8,10-11).

Because the Levites had proven their loyalty to God, and did not show favoritism even to their closest relatives (vs. 8-9) they deserved to be the teachers and judges of all Israel, not merely their own tribe (Or HaChaim).

”This stunning assertion that Jesus was high priest further undermines the Church's claim that Jesus was a Davidic king. Simply put, the same man can never be both high priest and king. The high priest must be a descendant of Aaron (the brother of Moses), who was a descendant from the tribe of Levi. A Davidic king, on the other hand, has to trace his lineage from the House of David, descended from the tribe of Judah. It is impossible for the same person to be both a member of the tribe of Levi and Judah” (Rabbi Tovia Singer).

Where is our Messiah?

http://www.outreachjudaism.org/articles/judaism-no-king.html

A glimpse of the Messianic king we therefore have in Ezekiel 44:3 and 46:2: "The prince [I permit]-he is a prince; he shall sit therein to eat bread before the Lord; by the way of the hall of the gate he shall come, and by the same way he shall leave." This NASI is "the Cohen Gadol, who because of his importance is permitted to eat the bread and meat of holy offerings in that gateway, which is opened for him when he eats" (Rashi on v 3). Metzudas David (on v 3) states that this NASI is Melech HaMashiach. 

"
And the prince shall enter by way of the vestibule of the gate without, and he shall stand at the doorpost of the gate, and the priests shall offer his burnt-offering and his peace-offering, and he shall prostrate himself at the threshold of the gate, and go out, but the gate shall not be closed until the evening." In the words of Ramchal: "The East Gate is a place of the most intense light and power, and cannot be opened for the creatures of the lower worlds except on the Sabbath and the New Moon. This is because it is in direct alignment with the Great Gate, the center column, and must therefore be kept closed. It can only be opened for the Prince, namely the Messianic King. Because of his great strength and paramount importance, this gate will be open for him, but no-one else will be able to enter except on those two days… On these days the Shechinah receives a very great light indeed from Tiferet . For this reason this gate will be opened on these two days and the people will come to prostrate themselves and share its great light" (Ramchal, Mishkney Elyon). AZAMRA.


Numbers 11:29 "Moses said to him (Joshua the son of Nun), "Are you zealous for my sake? If only all the Lord's people were prophets, that the Lord would bestow His spirit upon them!" Are you zealous for me? Are you being zealous for what I should be zealous? Are you zealous for my sake? The term is used to denote a person, who takes a matter to heart, whether to avenge or to help, i.e., holding the bulk of the burden, even non-Jews, who are ready to stand up and even fight with the Jews in their battles, (Isaiah 66:17-21).

"Thus said HaShem, Master of Legions: I have become zealous with great zeal on behalf of Zion; I have become zealous with great wrath on its behalf" (Zechariah 8:2). This is a chapter of comfort. At the end of the exile, God will direct His zeal to the defense of Jerusalem and vengeance against its enemies.

"For Zion's sake I will not be silent, and for Jerusalem's sake I will not be still, until her righteousness emanates like bright light, and her salvation blazes like a torch" (Isaiah 62:1). God's vengeance for Edom's persecution of His people is described in Isaiah Ch. 63, through a dialogue between an anonymous onlooker and God Himself, as if He were a warrior coming from a destructive attack, on the Edomite city of Bozra, see also Isaiah Chs. 34-35 which  refers to the future destruction of the kingdom of Rome and the salvation of Israel.

Ezekiel 39:25 "Therefore, thus said the Lord Hashem/Elohim: Now I will bring back the captivity of Jacob and show mercy to the entire House of Israel, AND BE ZEALOUS FOR MY HOLY NAME."

Ezekiel 36:20-23 Israel 's ignominious exile and degradation in the lands of the nations is CHILUL HASHEM, a desecration of God's name. Conversely, the ingathering of Israel before the very eyes of their enemies is the sanctification of His name, for they will know that God rules.

"And they entered the nations where they came, and they profaned My Holy Name, inasmuch as it was said of them, 'These are the people of the Lord, and they have come out of His land.' But I had pity on My Holy Name, which the house of Israel had profaned among the nations to which they had come. Therefore, say to the house of Israel; So says the Lord God: Not for your sake do I do this, O house of Israel, but for My Holy Name, which you have profaned among the nations to which they have come. And I will sanctify My great Name, which was profaned among the nations, which you have profaned in their midst; and the nations shall know that I am the Lord-is the declaration of the Lord God-when I will be sanctified through you before their eyes. For I will take you from among the nations and gather you from all the countries, and I will bring you to your land."
 
The ingathering of the exiles takes place before their purification. This should give us hope that even though many of the ingathered Jewish inhabitants of the land are still far from the Torah, if God has fulfilled His promise to bring them back physically, He will in the end surely fulfill His promise to bring them back spiritually.

"And I will sprinkle clean water upon you, and you will be clean; from all your impurities and from all your abominations will I cleanse you. And I will give you a new heart (an inclination that has been renewed for the better), and a new spirit will I put within you, and I will take away the heart of stone out of your flesh, and I will give you a heart of flesh. And I will put My spirit within you and bring it about that you will walk in My statutes and you will keep My ordinances and do [them].Then will you dwell in the land that I gave your fathers, and you will be a people to Me, and I will be to you as a God" (Ezekiel 36:24-28).

Zecharia 13:1 "On that day, a spring shall be opened for the house of David and for the inhabitants of Jerusalem, for purification and for sprinkling." The commentators associate this "spring" with the spring that will come forth from under the Temple threshold as prophesied in Ezekiel ch 47 and Joel 4:18 as well as in Zechariah 14:8 (Metzudas David). Targum Yonasan says this will be a fountain of Torah teachings that will purify people from their sins just as the waters of the ashes of the red heifer purify from defilement from contact with the dead.

Zechariah 8:6 "So said the Lord of Hosts: As it will be wonderful in the eyes of the remnant of this people in those days, it will also be wonderful in My eyes, says the Lord of Hosts.""How I returned from the great wrath. And our Sages expounded on [this phrase], concerning the slaughter of the evil inclination, in tractate Sukkah (52a), (Zechariah 13:2).