American Standard Version (ASV):
And I will execute great vengeance upon them with wrathful rebukes; and they shall know that I am Jehovah, when I shall lay my vengeance upon them.
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.