I. This is foretold by a sign. Jeremiah must take great stones, such as are used for foundations, and lay them in the clay of the furnace, or brick-kiln, which is in the open way, or beside the way that leads to Pharaoh's house (v. 9), some remarkable place in view of the royal palace. Egypt was famous for brick-kilns, witness the slavery of the Israelites there, whom they forced to make bricks (Exod. v. 7), which perhaps was now remembered against them. The foundation of Egypt's desolation was laid in those brick-kilns, in that clay. This he must do, not in the sight of the Egyptians (they knew not Jeremiah's character), but in the sight of the men of Judah to whom he was sent, that, since he could not prevent their going into Egypt, he might bring them to repent of their going.