Why did Hashem swear?
Malbim: He decreed with a Shevu'ah.
What is "b'Kodsho"?
Radak: It is Shamayim.
What is the meaning of "v'Nisa Eschem b'Tzinos"?
Rashi citing Targum Yonasan: Nations will take you on their shields. Radak ? Tzinos is like "Tzinah v'Socherah" (Tehilim 91:4).
Radak: Some say that Tzinos are kinds of thorns. [The enemy] will carry and drag them like people drag fish via a thorn ? "uv'Cho'ach Tikov Lecheyo" (Iyov 40:26).
Malbim: The enemy will carry you honorably, in chariots.
What is the significance of "v'Acharischen b'Siros Dugah"?
Targum Yonasan: Your daughters will be taken in boats of Tzaidin. Rashi ? these are small fishing boats. It says Sir, because they are small. We find Dugis in a Mishnah (Bava Basra 73a). Dunash explained, we find that a person's descendants are called Acharis ? 'uch'Amdo Tishaver Malchuso v'Sechatz l'Arba Ruchos ha'Shamayim v'Lo l'Achariso" (Daniel 11:4) ? i.e. he will not leave his kingship to his son.
Radak: Some say that Siros are kinds of thorns.
Malbim: In the end, you will be so disgraced that they will not take you in boats used to transport people, rather, in boats made like a pot, in which they transport fish. They lay one down on another.