What is "Oy l'cha Mo'av" referring to?
Rashi: It refers to Bil'am's curse of Mo'av - that they would be delivered into the hands of Sichon. 1
Targum Yonasan: It refers to those who hate the Tzadikim.
See Sifsei Chachamim.
What are the connotations of "Am K'mosh"?
Rashi and Ramban: It means the people of K'mosh, the god of Mo'av (to whom the people were totally devoted - Ramban). 1
Targum Yonasan: It means that Mo'av (who hate the words of Torah, cannot be rectified until they go into exile ?)
Ramban: See Yeshayah, 16:12 and Yirmiyah, 48:7, 35.
Who turned Mo'av's sons into refugees and its daughters captives?
Rashi: The unnamed victor (with reference either to Sichon or to Hakadosh-Baruch-Hu).
Refer to 21:29:2:2.
Ramban and R. Bachye: See Mal'achi 2:11, where the Navi refers to the adherents of K'mosh as 'its sons and daughters'.
R. Bachye: As the parable-sayers declared mockingly.
Ramban: K'mosh was also one of the gods of Amon, as the Pasuk specifically writes in Shoftim, 11:24.
