Eleh HaDevarim on the root of Korach's sin. Rav Schwab on what Korach "took". What does the 2nd pasuk seem to be a repetition of the first? Rav Soloveitchik on how the machloket of Korach is alive and well in our day.
Kli Yakar on the command not to be like Korach like Hashem told Moshe
Why do many of the mizmorim of B'nei Korach focus on Yerushalayim?