Kedushat Levi
The reason why Datan and Aviram added a complaint against Moses that Korach had not mentioned, when they said: “you also did not bring us to a land of milk and honey,” (Numbers 16,13) was that Korach was a member of the tribe of Levi that had not been condemned to die in the desert. Korach therefore could not have leveled this accusation at Moses. [According to a view expressed in Baba batra 121. Ed.]