Jamieson, Fausset and Brown on Jeremiah 25:34

34. shepherds--princes (Jr 22:22). Here he returns to the Jews and their rulers, using the same image as in Jr 25:30, "pasture" (see on Jr 25:30).

wallow yourselves--Cover yourselves as thickly with ashes, in token of sorrow, as one who rolls in them (Jr 6:26; Eze 27:30) [Maurer].

principal--leaders. The Septuagint translates "rams," carrying out the image (compare Is 14:9, Margin; Zec 10:3).

days of your slaughter ... of ... dispersions--rather, "your days for slaughter (that is, the time of your being slain), and your dispersions (not 'of your dispersions'), are accomplished (are come)."

pleasant vessel--Ye were once a precious vessel, but ye shall fall, and so be a broken vessel (see on Jr 22:28). "Your past excellency shall not render you safe now. I will turn to your ignominy whatever glory I conferred on you" [Calvin].