Note 354 — Chapter X
Reading edition
Since it is the capital that has been struck, and the command is given to break the thresholds on the head of all of them, many translate lintels or architraves instead of thresholds (e.g. Hitzig, and Guthe in Kautzsch's Bibel). But the word סִפִּים always means thresholds and the blow here is fundamental.