remnant - excepting the poorest (Jer 39:10), who caused Nebuchadnezzar no apprehensions.
those ... that fell to him - the deserters were distrusted; or they may have been removed at their own request, lest the people should vent their rage on them as traitors, after the departure of the Chaldeans.
rest ... that remained - distinct from the previous “remnant”; there he means the remnant of those besieged in the city, whom Nebuchadnezzar spared; here, those scattered through various districts of the country which had not been besieged [Calvin].