Likewise when all the Jews that were in Moab, &c. Probably, upon the king of Babylon's first invading Judea, many fled, and more as he proceeded in his conquests, overrunning the country; and it is likely, at the taking of the city, many escaped and fled into different countries, as they had opportunity, or judged this or that country would be the safest place of refuge. Some, therefore, fled to Moab, some to Ammon, some to Edom, and some to other countries; but when they heard that the king of Babylon had appointed a governor over the country of their own nation and religion, they returned, and, there being few people left in the land, which was of itself wonderfully fruitful, they gathered a great quantity of grapes and other summer-fruits, such as it produced.
Related Commentaries of Jeremiah 40:11
Jeremiah 40:11-12
11 Likewise when all the Jews that were in Moab, and among the Ammonites, and in Edom, and that were in all the countries, heard that the king of Babylon had left a remnant of Judah, and that he had set over them Gedaliah the son of Ahikam the son of Shaphan;
12 Even all the Jews returned out of all places whither they were driven, and came to the land of Judah, to Gedaliah, unto Mizpah, and gathered wine and summer fruits very much.