Jeremiah
Jeremiah 50:31ESV·traditional attribution

“Behold, I am against you, O proud one, declares the Lord GOD of hosts, for your day has come, the time when I will punish you.

John Calvin Reformed @genevareformer

Jeremiah, in order more fully to confirm what he had said, again introduces God as the speaker. And we have stated how necessary this was, because he could have hardly gained credit otherwise to his prophecy; but when he introduced God, he removed every doubt.

Matthew Henry Presbyterian @wholebiblehenry

Here, 1. The forces are mustered and commissioned to destroy Babylon, and every thing is got ready for a descent upon that potent kingdom: Go up against that land by Merathaim, the country of the Mardi, that lay part in Assyria and part in Armenia; and go among the inhabitants of Pekod, another country (mentioned Eze 23:23) which Cyrus took in his way to Babylon.

Commenting on Jeremiah 50:21-32

John Gill Reformed Baptist @doctorgill

Behold, I am against thee, O thou most proud, saith the Lord God of hosts,.... Or, O "pride", or O "man of pride" (i); intolerably proud, superlatively so, as the kings of Babylon were, as Nebuchadnezzar, and Belshazzar likewise, the present king; so the Targum interprets it of a king, "behold, I send my fury against thee, O wicked king;'' and is applicable enough to...