1)
What will cause the Kohanim to be satiated?
1.
Radak: Avodas ha'Mikdash will return, and the Kohanim will be satiated from the many Korbanos from all places, like it says "Eilei Nevayos Yesharsunecha Ya'alu Al Ratzon Mizbechi" (Yeshayah 60:7).
2.
Malbim: Their spiritual Nefesh will be satiated from the influence of Korbanos.
2)
What is "Dashen"?
1.
Rashi: It is fat.
3)
What will cause the Am to be satiated?
1.
Malbim: They will have all good, to satiation.