Albert Barnes Commentary Jeremiah 50:28

"The voice of them that flee and escape out of the land of Babylon, to declare in Zion the vengeance of Jehovah our God, the vengeance of his temple." — Jeremiah 50:28 (ASV)

The voice of them ... - that is, there is a sound of fugitives escaping from Babylonia. The Jews saw in the fall of Babylon Yahweh’s vengeance for His temple.