1. R'Bechaya - Severity of Punishment of Korach and his people.
2. Rambam - Describing different types of miracles extraordinary vs. within nature.
3. Chinuch - Responsibilities of the Levi'im and the Kohanim are slated for each one specifically and are not shared - Limitations of shared responsibilities.
4. R' Bechaya - Explaining why salt preserves and is used on Korbanos to serve as a "bris".