This is what the LORD of Hosts says: “Babylon’s thick walls will be leveled, and her high gates consumed by fire. So the labor of the people will be for nothing; the nations will exhaust themselves to fuel the flames.”
KJV
Thus saith the LORD of hosts; The broad walls of Babylon shall be utterly broken, and her high gates shall be burned with fire; and the people shall labour in vain, and the folk in the fire, and they shall be weary.
ASV
Thus saith Jehovah of hosts: The broad walls of Babylon shall be utterly overthrown, and her high gates shall be burned with fire; and the peoples shall labor for vanity, and the nations for the fire; and they shall be weary.