What is the Shevu'ah about?
Refer to 2:7:1:1-8.
Seforno: Do not rush Gog and Magog to come. If you do, you will be liable for my Shevu'ah.
Why does it say "Mah Ta'iru u'Mah Te'oreru"?
Refer to 2:7:1:1-3 and the notes there.
Malbim (Melitzah): Now she retracts, and says, you Bnos Yerushalayim, I put an oath on you not to arouse or contest the love - now you cannot distance nor bring close. I separated from physicality, and I will lodge "b'Tzel Shakai" (Tehilim 91:1)!
What is "Ad she'Techpatz"?
Refer to 2:7:4:1-4 and the notes there.
This Shevu'ah was already mentioned above (2:7, 3:5). Why is it repeated?
Rashi: Yisrael addresses the nations. Even though I complain and mourn, my Beloved holds my hand and supports me in my Galus. Therefore, I put an oath on you.