King James Version (KJV)
And they shall know that I {am} the LORD, {and that} I have not said in vain that I would do this evil unto them.
Modern English
They will know that I am Yahweh. I have not said in vain that I would do this evil to them.”’
Hebrew
וְיָדְע֖וּ כִּֽי־אֲנִ֣י יְהוָ֑ה לֹ֤א אֶל־חִנָּם֙ דִּבַּ֔רְתִּי לַעֲשׂ֥וֹת לָהֶ֖ם הָרָעָ֥ה הַזֹּֽאת׃
vyadʿv kiy-ʾaniy yhvah loʾ ʾel-ḥinam dibartiy laʿasvot lahem haraʿah hazoʾt