When Korah gathered 250 men, men of renown, against Moses, he did not rise up against an aging leader who he believed had usurped power. In fact, he rose up against a close relative—his first cousin. Their fathers, Amram and Izhar, were brothers, both sons of Kohath from the tribe of Levi.

All priests (Kohanim) are Levites, but not all Levites are priests. That is precisely the point at the heart of Korah's rebellion.

The tribe of Levi was set apart for service in the Mishkan in place of the firstborn because they did not participate in the sin of the golden calf (Num. 3:5–10). They were entrusted with caring for the Tabernacle, transporting its furnishings, and assisting in its ministry. Yet within the tribe of Levi itself, God established a further distinction.

Only Aaron and his descendants were chosen to serve as Kohanim. They alone were authorized to offer incense (notice that part!), present sacrifices upon the altar, and perform the priestly duties in the Holy Place.

"But you and your sons (talking to Aaron) shall attend to your priesthood for everything concerning the altar and that which is behind the veil; and you shall serve. I give your priesthood as a gift of service, but the outsider who comes near shall be put to death." (Num. 18:7)

This is exactly why Korah's challenge was so serious. Korah was already a Levite and already had sacred responsibilities. What he desired was access to the priestly functions that God had assigned specifically to Aaron and his sons. In other words, Korah was envious of his cousin's position.

That is why Moses says:

"Is it too little for you that the God of Israel has separated you from the congregation of Israel... and would you seek the priesthood also?" (Num. 16:9–10)

Korah did not understand at first the real cause of his complaints: envy, which he had been harbouring until he found the right opportunity.

After the tragic incident of the spies, as a consequence of which the Israelites were to wander for forty more years, all the people were disappointed and enraged. It was a very ripe time for a diabolical next move.

He was successful in gathering around him frustrated and dissatisfied elements who, like himself, were hungry for honour and publicity.

Theological ground for a deception is always just a twist in God's Word:

"And you shall be to Me a kingdom of priests and a holy nation." (Ex. 19:6)

 –  he is referring in his accusations.

This is precisely what makes Korah's argument so persuasive.

"If the whole nation is holy and elevated, why should Aaron's family alone hold the priesthood?"

Korah's theology was built upon a true text, but the application was twisted and the conclusion was false. Israel was indeed called "a kingdom of priests and a holy nation" (Ex. 19:6), yet God still appointed Aaron and his sons to the priesthood.

That is the quote from Korah speech: רַב־לָכֶם (rav lachem).

It is difficult to convey the force of the Hebrew expression in a short English sentence.

Literally:

"Much for you."
"Much is yours."

Or:

"You have enough already."

"You already possess enough honor and authority."

Or:

"You have taken too much greatness for yourselves."

"The entire congregation is holy, every one of them, and the Lord is among them. Why do you exalt yourselves above the assembly of the Lord?"

Moses does not defend himself. The true leader leaves his vindication to God.

All he does to fall on his face before the Lord, so he has a word from the Lord:

"I am warning you. Wasn't the death of Nadab and Abihu, who were Kohanim, but violated the boundaries of unauthorised approach to the Holy, enough for you to learn from?

Yet if you insist, let God decide.

This was a final opportunity for Korah to reconsider.

If you seek priestly status, perform the priestly act and allow God to judge.

An irony of God—to treat the crook by his own crookedness.

Korah says: "The whole congregation is holy."

Moses replies: "Very well. Let us place that claim before God. If everyone may serve as priest, Heaven will show it."

In the traditional translation of Num.16:5 you miss the struggle that is really taking place in the Moses respond to Korah in the repetition of the root  קרב (q-r-b):

The same root gives us:

·       קָרוֹב (karov) — near

·       קָרְבָּן (korban) — offering

·       לְהַקְרִיב (lehakriv) — to present an offering / bring near

·       הַקְרָבָה (hakravah) — the act of offering

וַיְדַבֵּר אֶל־קֹרַח וְאֶל־כָּל־עֲדָתוֹ לֵאמֹר בֹּקֶר וְיֹדַע יְהוָה אֶת־אֲשֶׁר־לוֹ וְאֶת־הַקָּדוֹשׁ וְהִקְרִיב אֵלָיו וְאֵת אֲשֶׁר יִבְחַר־בּוֹ יַקְרִיב אֵלָיו׃

Vayedabber el-Korach ve'el kol-adato lemor: Boker veyoda Adonai et asher lo, ve'et ha-kadosh vehikriv (perfect) elav; ve'et asher yivchar bo yakriv (imperfect) elav.

Two the same root verbs appear in different tenses: perfect points to God’s decision, imperfect to the manifestation of that decision.

An expanded translation would sound something like this:

"And he spoke to Korah and all his company in the morning the Lord will make known who is for Him and who is consecrated for a special service. He has already set him near for Himself for service. The one whom He chooses, He will draw near to Himself to minister before Him and present an offering."

Another words: God already has determined who presents the offering. Tomorrow He will demonstrate that choice."

Moses is speaking about access to sacred service for His Kohanim.

The incense offering, as we said, was one of the highest priestly functions. The question is not who can stand nearest to the Tabernacle—they already did—but who may legitimately perform the service before the Lord.

Moses announces a sign: if these men die ordinary deaths, Moses was not sent by God.

But if something entirely unusual occurs, then God has judged them.

The earth opens and swallows Dathan and Abiram.

Fire consumes the 250 men offering incense.

The censers of the 250 men are collected and hammered into plating for the altar.

Why preserve the censers?

Because they had become sanctified through their contact with holy service.

Even though their owners sinned, the vessels themselves have not.

The altar would now permanently remind Israel that priesthood is not seized by ambition.

It is granted by divine calling.

Once the sages said:

"Every dispute that is for the sake of Heaven will, in the end, endure; but every dispute that is not for the sake of Heaven will not endure. What is a dispute for the sake of Heaven? The dispute between Hillel and Shammai. And what is a dispute not for the sake of Heaven? The claims of Korah and all his company." (Pirkei Avot 5:17)

Disagreement is not something negative.

A dispute for the sake of Heaven is a dispute about truth. A dispute that is not for the sake of Heaven is a dispute about power.

That is a profound difference.

For if both sides engage in a discussion in order to clarify the truth, then even the one who turns out to be mistaken can rejoice. That person has also won, because the truth has been revealed.

But when personal interests enter the discussion, when there is a desire to win at any cost, to prove one's superiority over an opponent, then the dispute becomes a struggle for power. In such a dispute, both sides lose. It quickly descends into personal attacks, insults, and resentment, and what began as a discussion turns into a quarrel.

Korah appears as a populist who argued for power rather than for truth. Moses was distressed, because no matter what answer he would give, they would never accept it. Their goal was not truth, but power.

Therefore only God would bring the order to this matter, and He indeed have settled the deal.