John Gill Commentary Jeremiah 47:6

"O thou sword of Jehovah, how long will it be ere thou be quiet? put up thyself into thy scabbard; rest, and be still." — Jeremiah 47:6 (ASV)

O you sword of the Lord
For though it was the sword of the Chaldeans, yet being appointed and sent by the Lord, and having a commission from him, and being ordered and directed in his providence to do his will, it is called his sword:

how long [will it be] before you are quiet ?
and cease from destroying men; will you not cease till you have no more to destroy? put up yourself into your scabbard, rest, and be still ;
and make no more havoc among the people:

these are either the words of the Philistines, entreating a stop might be put to the ravages of the sword, and that the war might cease, and the desolations of it; or rather of the prophet, commiserating their state as a man, though they had been the avowed enemies of his people; to which the following words of him are an answer, either to the Philistines, showing why their request could not be granted, or as correcting himself.