1)
Who said this?
1.
Rashi: the nations mentioned above - Edom, Yishmael and all their colleagues.
2.
Radak: The officers of Midyan (in verse 12).
2)
What is "Ne'os Elokim"?
1.
Rashi: The habitation of Beis Elokim.
2.
Radak, Malbim: It is Eretz Yisrael. Yehoshafat said "Lavo Legarshenu mi'Yerushcha Asher Horashtanu" (Divrei ha'Yamim II, 20:11).