King James Version (KJV)
And I will execute great vengeance upon them with furious rebukes; and they shall know that I {am} the LORD, when I shall lay my vengeance upon them. {great vengeance: Heb. great vengeances}
Modern English
I will execute great vengeance on them with wrathful rebukes. Then they will know that I am Yahweh, when I lay my vengeance on them.”’”
Hebrew
וְעָשִׂ֤יתִי בָם֙ נְקָמ֣וֹת גְּדֹל֔וֹת בְּתוֹכְח֖וֹת חֵמָ֑ה וְיָֽדְעוּ֙ כִּֽי־אֲנִ֣י יְהוָ֔ה בְּתִתִּ֥י אֶת־נִקְמָתִ֖י בָּֽם׃
vʿashiytiy bam nqamvot gdolvot btvokḥvot ḥemah vyadʿv kiy-ʾaniy yhvah btitiy ʾet-niqmatiy bam