Malbim: Until now they fulfilled everything. However, now they did not fulfill dwelling in tents, for they dwelled in houses in Yerushalayim (verse 11). They answered that the other commands were Stam, but the command to dwell in tents was "Lema'an Tichyu Yamim Rabim" (verse 7). People who conquer lands do not conquer tent dwellers. However, now that Nebuchadnetzar came to destroy the land, living in tents was dangerous. If so, this was included in their father's command ¹ to dwell in a fortified city, for the purpose was to live long!