For the Sake of Heaven

Korah the son of Izhar, the son of Kohath, the son of Levi took [himself to one side] along with Dathan and Abiram..... [Korach 16:1]

Chazal state in Pirkei Avos [5:20] : ''Any dispute that is for the sake of Heaven will have a constructive outcome, but one that is not for the sake of Heaven will not have a constructive outcome.''

What sort of dispute was for the sake of Heaven? - the dispute between Hillel and Shammai. And which was not for the sake of Heaven? - the dispute between Korach and his entire company.

Why, asked R'Yonason Eybeschutz, does the Mishnah state: ''The dispute between Korach and his entire company''?  Wasn't the dispute between Korach and Moshe?

From here we learn, said R'Eybeschutz, that the dispute was not between Korach and Moshe at all; rather, it was really between Korach and his assembly, as each one of them was vying for leadership and power!  Moshe Rabbeinu, however, did not take up their quarrel; on the contrary, he tried his utmost to appease them so as not to carry on a dispute that would eventually lead to disastrous results.

Source: Rabbi Yisrael Bronstein