13. is it not of the Lord of hosts--JEHOVAH, who has at His command all the hosts of heaven and earth, is the righteous author of Babylon's destruction. "Shall not God have His turn, when cruel rapacious men have triumphed so long, though He seem now to be still?" [CALVIN].
      people . . . labour in the . . . fire . . . weary themselves for . . . vanity--The Chaldeans labor at what is to be food for the fire, namely, their city and fortresses which shall be burnt. Jer 51:58 adopts the same phraseology to express the vanity of the Chaldean's labor on Babylon, as doomed to the flames.

JFB.