Jeremiah 21:13 - Ellicott's Commentary On The Whole Bible

O inhabitant of the valley... — The noun, as the marginal “inhabitress” shows, is feminine; and, as in “the daughter of Zion” for Zion itself, describes the lower city of Jerusalem, Isaiah’s “valley of vision” (Isaiah 22:1; Isaiah 22:5), the Tyropœon of Josephus. The “rock of the plain” (comp. Notes on Jeremiah 17:3; Jeremiah 18:14) is, in like manner, the higher city built on the hill of Zion. The king and his people trusted, as the Jebusites had done of old (2 Samuel 5:8), in what seemed to them the impregnable strength of their natural position. There seems no adequate reason for taking the words as symbolising the kingly house of Judah, but it is probable enough that local associations, palaces on the hill or in the valley, may have given the words a specially pointed application.