What did the Navi hear?
Radak: It is as if an angel sends to the nations and tells them to gather for war against Batzrah and its cities.
Malbim: This begins the Nevu'ah for the future.
What is the meaning of "v'Tzir ba'Goyim Shalu'ach"?
Malbim (Ovadyah 1:1): Messengers 1 will go among the Yishmaelim 2 to arouse each other "let us rise against [Edom] in war."
Metzudas Tziyon: Tzir is a Shali'ach, like "Tzir Ne'eman" (Mishlei 25:13).
The other Meforshim imply that Sheluchim will go around all the nations. (PF)
Which nations will gather?
Malbim: All will gather, for Edom will be great. All will be needed to fight against Malchus Romi, which includes all of Edom.
