1)
What is the meaning of "b'Shelach Ya'avoru"?
1.
Ibn Ezra: They will die via lethal weapons, like "Yego'ashu Am va'Ya'avoru" (34:20).
2.
Malbim: They will die via the Satan's weapon and sword.
2)
What is "v'Yigve'u bi'Vli Da'as"?
1.
Malbim: They will die because they did not know Hashem's ways and tests, and they spoke against Hashem.
