Jamieson, Fausset and Brown on Jeremiah 25:38

38. his covert--the temple, where heretofore, like a lion, as its defender, by the mere terror of His voice He warded off the foe; but now He leaves it a prey to the Gentiles [Calvin].

fierceness of ... oppressor--rather, as the Hebrew, for "oppressor" is an adjective feminine, the word "sword" is understood, which, in Jr 46:16; 50:16, is expressed (indeed, some manuscripts and the Septuagint read "sword" instead of "fierceness" here; probably interpolated from Jr 46:16), "the oppressing sword." The Hebrew for "oppressing" means also a "dove": there may be, therefore, a covert allusion to the Chaldean standard bearing a dove on it, in honor of Semiramis, the first queen, said in popular superstition to have been nourished by doves when exposed at birth, and at death to have been transformed into a dove. Her name may come from a root referring to the cooing of a dove. That bird was held sacred to the goddess Venus. Vulgate so translates "the anger of the dove."

his ... anger--If the anger of Nebuchadnezzar cannot be evaded, how much less that of God (compare Jr 25:37)!