Why does it say "Hashem Tzevakos Elokei Yisrael"?
Radak: I am the Adon (master) of legions above and below. I will bring against you an army below. Even though they sinned in front of Me and served idolatry, I am their G-d, for not all sinned, and the minority who sinned will retract.
Why does it say "Mevi" without an Aleph at the end?
Radak: The Aleph is omitted.
What are "Kol Areha"?
Radak: They are Arei Yehudah. All were close to Yerushalayim; it was primary.
Above (18:8), he said that Hashem is considering [whether or not to bring the evil]. Why did he say here that Hashem will [surely] bring it?
Malbim: This is like the Ramban says, that when Hashem commands to do an action with a Nevu'ah, it is absolute and Hashem will not retract.
Why does it say that they made their necks stiff?
Malbim: They did not want to repent, therefore their decree was sealed - "Samti Panai Al ha'Ir ha'Zos l'Ra'ah" (21:10).
