Jamieson, Fausset & Brown, on Jer 51:46

“And lest your hearts faint, and ye fear for the rumour that shall be heard in the land: and a rumour shall come in one year, and after this year another rumour: and iniquity in the land, and ruler upon ruler.”

“And lest--Compare, for the same ellipsis, Gen 3:22; Exo 13:17; Deu 8:12. "And in order that your heart may not faint at the (first) rumor" (of war), I will give you some intimation of the time. In the first "year" there shall "come a rumor" that Cyrus is preparing for war against Babylon. "After that, in another year, shall come a rumor," namely, that Cyrus is approaching, and has already entered Assyria. Then is your time to "go out" (Jer 51:45). Babylon was taken the following or third year of Belshazzar's reign [GROTIUS]. violence in the land--of Babylon (Psa 7:16). ruler against ruler--or, "ruler upon ruler," a continual change of rulers in a short space. Belshazzar and Nabonidus, supplanted by Darius or Cyaxares, who is succeeded by Cyrus.”

Imported from an open dataset — not yet checked against the printed edition.