John Calvin on Jeremiah 50:37

The Prophet, indeed, changes the gender of the pronouns, and seems to refer to the king; but there is no ambiguity in the meaning, he then declares that the horses as well as the chariots would perish; for the sword would consume all the things used in war. And at the beginning he generally declared that destruction was nigh all the Chaldeans, so he repeats the same now, on all the promiscuous multitude, which is in the midst of Babylon. He says that they would be without courage, for the Lord would dishearten them by terror, as it will be hereafter stated again. Then he joins, and on her treasures, and they shall be a prey to enemies. It follows, —

Jeremiah 50:38

38. A drought is upon her waters; and they shall be dried up: for it is the land of graven images, and they are mad upon their idols.

38. Siccitas super aquas ejus et arescent; quia terra sculptilium est, et iis idolis (proprie, in terroribus, vel, terriculamentis) gloriantur (vel, insaniunt.)