Jeremiah 5:13

Shall become wind; a proverbial speech, very frequent, not in common language only, but Scripture also, Job 6:26 Ecclesiastes 5:16, and elsewhere; i.e. all the prophet's threats shall come to nothing: and thus they scoffed at them, Tush, what do they signify? they are but bruta fulmina: see 2 Chronicles 36:15,16. The word is not in them: this, possibly, they give as the reason that they apprehend the prophets words to be but as wind, because they are not from God, they speak but dreams of their own fancying. Thus shall it be done unto them; it shall fall upon their own heads that have thus threatened us, not upon us; or, we will kill them with the sword for thus vainly threatening us; we will use them like false prophets, as they are; and we shall see in the sequel of this prophecy how they used Jeremiah: or it may be an imprecation: q.d. May it fall upon their own heads: thus the Hebrew, So be it unto them.