Jeremiah 43:9

Take great stones in thine hand and hide them in the clay in the brick-kiln which is at the entry of Pharaoh's house in Tahpanhes, in the sight of the men of Judah, so that he would have trustworthy witnesses of his act. The palace of Pharaoh included not only the buildings proper, but their entire enclosure as well, which usually was surrounded by a high wall. Opposite the entrance of this enclosure the bricks for the building or for the repairing of the royal palace were made, and it was in the clay of this kiln that the stones carried by Jeremiah were to be hid.