13. serve other gods—That which was their sin in their own land was their punishment in exile. Retribution in kind. They voluntarily forsook God for idols at home; they were not allowed to serve God, if they wished it, in captivity (Da 3:12; 6:7).
day and night—irony. You may there serve idols, which ye are so mad after, even to satiety, and without intermission.