Charles Ellicott Commentary 1 Kings 7:6

"And he made the porch of pillars; the length thereof was fifty cubits, and the breadth thereof thirty cubits; and a porch before them; and pillars and a threshold before them." — 1 Kings 7:6 (ASV)

A porch of pillars, although by some authorities it is held to be a separate building, seems by the exact agreement of dimensions—its "length" being just the breadth of the hall—to have been a propylæon, or entrance vestibule, to the hall of state (like the porch, or vestibule, of the Temple), probably corresponding in the general arrangement of its pillars, and perhaps also in height. It had also a porch of its own, with a threshold (for the last clause of the verse should be rendered, and a porch before it with pillars, and a threshold before them,) forming a kind of plinth, or, possibly, a flight of steps.