Commentaries
4:1-8 The prophet was to represent the siege of Jerusalem by signs. He was to lie on his left side for a number of days, supposed to be equal to the years from the establishment of idolatry. All that the prophet sets before the children of his people, about the destruction of Jerusalem, is to show that sin is the provoking cause of the ruin of that once flourishing city.
2. fort—rather, "watch-tower" (Jer 52:4) wherein the besiegers could watch the movements of the besieged [Gesenius]. A wall of circumvallation [Septuagint and Rosenmuller]. A kind of battering-ram [Maurer]. The first view is best.
a mount—wherewith the Chaldeans could be defended from missiles.
battering-rams—literally, "through-borers." In Eze 21:22 the same Hebrew is translated "captains."