Why does it say "Peresah Tziyon b'Yadeha"?
Rashi: This is like "u'Farash Yadav b'Kirbo" (Yeshayah 25:11). It is like one who stretches his hands - he extends them and withdraws them, and is pained over them. Ibn Ezra - the prefix Beis in b'Yadeha is extra, like "va'Tashkemo bi'Dma'os Shalish" (Tehilim 80:6).
Rashi citing Menachem: It is an expression of breakage, like "Pores Ein Lahem" (4:4). Ri Kara - it is like "Paros la'Ra'ev Lachmecha" (Yeshayah 58:7) - slice your bread for the hungry.
What is the meaning of "Tzivah Hashem l'Yakov Sevivav Tzarav"?
Rav Sadya Gaon: Hashem decreed about Beis Yakov that its enemies will crown (surround) it.
Rashi: Hashem decreed about Yakov that its enemies will surround it. Even when Yisrael were exiled to Bavel and Ashur, Sancheriv exiled their enemies Amon and Mo'av and stationed them by Yisrael, and they vex them. This is like it says in Kidushin (72a), the entire city of Humiya in Bavel is Amonim.
Ibn Ezra: Hashem decreed that enemies around Yerushalayim will be Metamei it, and it will be like a Nidah.
Ri Kara: Hashem decreed that all Tziyon's neighbors will afflict it.
What is "l'Nidah"?
Rav Sadya Gaon, R. Avigdor #1: It is one who is distanced.
R. Avigdor #2: It is a true Nidah (refer to 1:8:3:4).
R. Avigdor #3: She is like a Tamei Nidah, who can become Tehorah via a Mikveh. So Hashem will be Metaher Yisrael - "v'Zarakti Aleichem Mayim Tehorim" (Yechezkel 26:35).
R. Avigdor #4: Like a Nidah, and unlike Tum'as Mes. If a Mes is in the house, a Kohen Gadol 1 may not enter. If a Nidah is in the house, a Kohen Gadol may enter, as long as she does not move him.
Ri Kara: It is disgraced and lowly to all the nations, like Tum'as Nidah.
Palgei Mayim: The Shechinah does not dwell in Yerushalayim, as if she is a Nidah
Also a Kohen Hedyot may not enter! Perhaps he teaches about a Kohen Gadol due to the Seifa, to teach that even a Kohen Gadol may enter a house with a Nidah. (PF)
