16 The verb רֹעוּ (ro’u) is a Qal imperative, masculine plural from רָעַע (ra’a’, “break”). Elsewhere both transitive (Job 34:24; Ps 2:9; Jer 15:12) and intransitive (Prov 25:19; Jer 11:16) senses are attested for the Qal of this verb. Because no object appears here, the form is likely intransitive: “be broken.” In this case the imperative is rhetorical (like “be shattered” later in the verse) and equivalent to a prediction, “you will be broken.” On the rhetorical use of the imperative in general, see §34.4c; §110.c.
17 The imperatival form (Heb “be shattered”) is rhetorical and expresses the speaker’s firm conviction of the outcome of the nations’ attack. See the note on “be broken.”
18 The initial imperative (“get ready for battle”) acknowledges the reality of the nations’ hostility; the concluding imperative (Heb “be shattered”) is rhetorical and expresses the speakers’ firm conviction of the outcome of the nations’ attack. (See the note on “be broken.”) One could paraphrase, “Okay, go ahead and prepare for battle since that’s what you want to do, but your actions will backfire and you’ll be shattered.” This rhetorical use of the imperatives is comparable to saying to a child who is bent on climbing a high tree, “Okay, go ahead, climb the tree and break your arm!” What this really means is: “Okay, go ahead and climb the tree since that’s what you really want to do, but your actions will backfire and you’ll break your arm.” The repetition of the statement in the final two lines of the verse gives the challenge the flavor of a taunt (ancient Israelite “trash talking,” as it were).