Jeremiah 51:33

The daughter of Babylon... — More literally, The daughter of Babylon is like a threshing-floor, in the time when it is trodden (i.e., when it is being prepared for the actual process), yet a little while, and the time of harvest shall come to her. The imagery is so familiar that it hardly needs an illustration (see Psalms 1:4; Isaiah 21:10; Isaiah 28:27; Micah 4:13). The time of “her harvest” of the Authorised version is ambiguous. What is meant is that the heaped-up treasures of Babylon are but as the harvest which shall be reaped by her conquerors, and the city itself as the threshing-floor on which men shall trample on the plunder.