they shall be as the morning cloud ... dew - (Hos 6:4). As their “goodness” soon vanished like the morning cloud and dew, so they shall perish like them.
the floor - the threshing-floor, generally an open area, on a height, exposed to the winds.
chimney - generally in the East an orifice in the wall, at once admitting the light, and giving egress to the smoke.