זכריה א:טז פירוש: רש״י ורד״ק

and a plumb line shall be stretched out to measure its wall, its length and breadth.

" Therefore thus saith the Lord" the Kethib has a heh at the end, like (a dwelling). The Keri is without the heh. The word signifies a building line, a cord, which they stretch over the row of bricks.