1)
What is the meaning of "va'Yir'u"?
1.
Radak: All will fear Hashem when they see the vengeance.
2.
Malbim: All will see how their punishment was Midah k'Neged Midah, and they will understand that it was from Hashem, and there is Hashgachah and justice.
2)
How will they tell Hashem' action?
1.
Radak (11, citing Shocher Tov): "Daryavesh wrote to all nations..." (Daniel 6:26).
3)
What will they understand?
1.
Radak: They will understand that Hashem judges and oversees people and pays them according to their deeds, unlike they said "Mi Yir'eh Lamo" (verse 6).
2.
Malbim: They will understand [Hashem's actions.
