What is "Es Laharog"?
Rashi: It is time to kill an entire nation, when its day of recompense comes - "u'She'erisech Yaharog" (Yeshayah 14:30).
Ibn Ezra: It is a time to crush. A proof is "v'Es Lirpo 1 ."
Metzudas David: A time to overtly kill someone.
What was killed cannot be healed. We find "Machatzti va'Ani Erpa" (Devarim 32:29). (PF)
What is the significance of "v'Es Lirpo"?
Rashi: It is healing a broken nation, like it says about Egypt "v'Rafo v'Shavu Ad Hashem n'Netar Lahem u'Rfa'am" (Yeshayah 19:22).
Ri Kara: We find that the beginning was bitter ("Es Laharog"), and the end is sweet. R. Avigdor - until now, the good [time] preceded the evil. From now and onwards, the evil is first. This shows that the world depends on Mazal, and [Mazal] is not fixed for Yisrael (Shabbos 156a). Via their Teshuvah, they reverse Mazal - "b'Yadecha Itosai" (Tehilim 31:16).
Metzudas David: He heals him from the illness, lest he die.
What matter does this discuss breaching?
Rashi: The city wall, when it is decreed in it - "v'Chomas Yerushalayim Meforatzes" (Nechemyah 1:3).
Ibn Ezra: This shows that the times apply also to matters without vegetation.
What will be built?
