ה֣וֹי שׁוֹדֵ֗ד וְאַתָּה֙ לֹ֣א שָׁד֔וּד וּבוֹגֵ֖ד וְלֹא־בָ֣גְדוּ ב֑וֹ כַּהֲתִֽמְךָ֤ שׁוֹדֵד֙ תּוּשַּׁ֔ד כַּנְּלֹתְךָ֥ לִבְגֹּ֖ד יִבְגְּדוּ־בָֽךְ׃ (ס)
Woe to thee that spoilest, and thou wast not spoiled; And dealest treacherously, and they dealt not treacherously with thee! When thou hast ceased to spoil, thou shalt be spoiled; And when thou art weary with dealing treacherously, they shall deal treacherously with thee.
Rashi
Woe To the enemy, that you constantly spoil, but you are not spoiled, and you constantly deal treacherously, but no man deals treacherously with you or spoils you.
Ibn Ezra
הוי Ho!1See c. i., note 13. Interjection of calling. The prophet addresses Assyria.
Rashi
when you finish being a spoiler, when you finish your spoiling of those upon whom it was decreed to be spoiled by you, you shall be spoiled.
Rashi
when you finish dealing treacherously (כַּנְּלֹתְךָ) Menahem classified כַּנְלֹתְךָ with (Job 15: 29) “And their destruction (מִנְלָם) shall not fall to the earth,” in one group (Machbereth Menahem, p. 123). In the word מִנְלָם, the first ‘mem’ is a radical which sometimes is absent, like the ‘mem’ of מַאֲמָר, a statement, and of מַדָּע, knowledge, and it is possibly an expression of ending, according to the context.
Rashi
כַּנְּלֹתְךָ is an expression of ‘when you finish.’ “And מִנְלָם shall not fall to the earth,” the destruction decreed upon them shall not fall to the earth to become progressively void, but will become progressively stronger.