The Torah testifies that Moshe was a most pious man. וְהָאִישׁ מֹשֶׁה עָנָיו מְאֹד מִכֹּל הָאָדָם, “And the man Moshe was exceedingly humble more than any person…” (Num. 12,3) Yet Korach and his followers attacked Moshe claiming that he took too much power for himself. Their punishment for this disrespect and for doubting Moshe that Hashem had appointed him for this position was that the earth opened up and swallowed him and all the people with him.
In relating this episode in the Portion of Pinchas the Torah says: וּבְנֵי קֹרַח לֹא מֵתוּ, “But the sons of Korach did not die.” (Num. 26,11) This implies that the children of Korach and the spirit of Korach did not perish. In all times there are people who find fault in leaders and criticize unjustly.
Many Rabbis in their congregations have to deal with this unjustified opposition. There are always people who for selfish reasons or to show they are more powerful than the Rabbi, begin with their criticism and before long they get friends and other followers to join them and too often the Rabbi has to be dismissed. We must be ever mindful of how serious an offense this is by recognizing the punishment netted out to Korach and his followers.