C. F. Keil and Franz Delitzsch on Jeremiah 9:20

Jer 9:20

Death comes in through (in at) the windows, not because the doors are to be thought of as barricaded (Hitz.), but as a thief in the night, i.e., suddenly, in an unexpected way. Perhaps Jeremiah was here thinking of Joe 2:9. And comes into the palaces, i.e., spares no house, but carries off high and low. The second clause is not to be very closely joined with the first, thus: Death comes into the houses and palaces, to sweep the children from off the streets; this would be self-contradictory. We must rather repeat "comes" from the first clause: He comes to sweep off the streets the child at play. That is: In the houses and palaces, as upon the streets and highways, he will seize his prey.