I will punish Bel in Babylon - Bel or Belus was their supreme deity.
That which he hath swallowed up - The sacred vessels of the temple of Jerusalem, which were taken thence by Nebuchadnezzar, and dedicated to him in his temple at Babylon.
The wall of Babylon shall fall - It shall cease to be a defense; and shall moulder away until, in process of time, it shall not be discernible.
The sacred vessels plundered from Jerusalem, and laid up in the very temple of Bel, should be restored; the men and women dragged from other lands to people the city, released; and its wall falling would show the insignificance to which it should be reduced.