“I will punish Bel

In Babylon.

I will make him

Disgorge

What he has swallowed.

The nations shall no longer

Stream to him.

The wall of Babylon

Has fallen.”

Yahweh says that he was going to punish Bel, the god of Mesopotamia. Thus with the defeat of Babylon, the god Bel was also defeated. The punishment was that Bel had to throw up what he had eaten. All those nations where Bel was their god would no longer stream to his temple, because Babylon had fallen.