What are "Yivlei Mayim"?
Rashi: They are rivers - "v'Al Yovel Yeshalach Sharashav" (Yirmeyah 17:8).
Will this be "b'Yom" (during the day)? Machaneh Ashur was stricken at night!
Radak: "B'Yom" is at the time, like "b'Yom Hakosi Kol Bechor" (Bamidbar 3:13; it was at night), "Yom Tza'akasi va'Laylah Negdecha" (Tehilim 88:2). Every 'ba'Yom ha'Hu' refers to the future (but not a particular day).
What is "Hereg Rav"?
Radak: A great slaughter [Radak - of Machaneh Ashur 1 . After that, Hashem blessed the residents of Yerushalayim and Yehudah with all good.
Malbim: The enemy was killed; they no longer feared them.
What are "Migdalim"?
Radak, Targum Yonasan: They are great officers - "va'Yachched Kol Gibor Chayil v'Nagid v'Sar b'Machaneh Malveh Ashur" (Divrei ha'Yamim II, 32:21).'
Malbim: They are towers made for war; they will not be needed any more.
QUESTIONS ON RASHI
Rashi writes that "Yivlei Mayim" are rivers. Why will there be rivers?
Radak: It said (23) that there will be rain. There will be so much rain that water will flow from the mountains and hills.
Rashi: Initially, They sealed all springs and gathered the water channels and reservoirs into the city, so the enemy would not find water to drink, like it says in Divrei ha'Yamim. Now, every mountain, and even every hill, which does not normally have springs, will have springs.
