Hilchot Tefilla - Korach va’adato

(1) NOW KORAH, THE SON OF IZHAR…TOOK. This event occurred in the wilderness of Sinai when the first-born were set aside and the Levites were placed in their stead. Israel thought that our master Moses acted out of his own will in giving his brother an elevated position... The Levites rebelled against Moses because they were subservient to Aaron and his sons. Dathan and Abiram rebelled because Moses removed the birthright from Reuben their forefather, and gave it to Joseph. It is also possible that they suspected that Moses favored the tribe of Joseph because Joshua was his assistant. Korah too was a first-born, as Scripture clearly states. ...The princes of the congregation were first-born. They offered the burnt offering. They therefore took the fire pans. The miracle of the staff, which demonstrated to all of Israel that God chose the Levites in place of the first-born, is proof that this explanation is correct. Hence Scripture reads, that there may be made an end of their murmurings against Me (Num. 17:25), for the murmuring was an account of this. Moses also said, that I have not done them of mine own mind (v. 28). He said the aforementioned because Israel had come to believe that he had acted on his own... Here is another rigorous proof: seeing all the congregation are holy (v. 3). The aforementioned alludes to the first-born who are holy, for Scripture states, Sanctify unto Me all the first-born (Ex. 13:2). The first-born were the priests that come near to the Lord (Ex. 19:22). They were the most important ones of the congregation

...Now as long as Israel was in the wilderness of Sinai no evil happening befell them, for even after the incident of the [golden] calf, which was a serious and well-known sin, those who died [as a punishment] were few, and the people were saved by Moses’ prayer when he fell down before the Eternal the forty days and forty nights. Thus they loved Moses as [they loved] themselves, and they obeyed him, so that had anybody rebelled against Moses at that time, the people would have stoned him. Therefore Korach endured the greatness of Aaron [when he was appointed High Priest], and the firstborns accepted [without protest] the high status of the Levites, and all [the other] acts of Moses. But when they came to the wilderness of Paran and [some people] were burnt in Taberah, and many died in Kibroth-hattaavah, and when after sinning [in the matter of] the spies Moses did not pray on their behalf, so that the decree against them was thus not annulled, and the princes of all the tribes died by the plague before the Eternal and it was decreed that the whole people would be consumed in the wilderness and there they shall die, then the mood of the whole people became embittered, and they said in their hearts that mishaps occur to them through Moses’ words. Therefore Korach found it an opportune occasion to contest Moses’ deeds, thinking that the people would [readily] listen to him. This was the intention of [the statement of Dathan and Abiram that Moses had taken the people out of Egypt] to kill us in the wilderness, meaning: “Behold, you have brought us to this place and you have not fulfilled that which you promised to give us, [namely to take us to] a land flowing with milk and honey, for you have not given us any inheritance at all; instead we will die in the wilderness

“and lay your hand upon him,” like one who lights a candle from a candle. (Numb 27:20) “Invest him with your majesty,” like one who pours from one vessel to another vessel

Rabban Gamliel said to them: Do you imagine that I am granting you authority, and since you did not want to accept the honor you did not come when I sent for you? I am granting you servitude, as it is stated: “And they spoke to him saying: If you will be a servant to this people today” (I Kings 12:7)