Jeremiah 43:9 Take great stones in thine hand, and hide them in the clay in the brickkiln, which [is] at the entry of Pharaoh's house in Tahpanhes, in the sight of the men of Judah;
Nahum 3:14 Draw thee waters for the siege, fortify thy strong holds: go into clay, and tread the morter, make strong the brickkiln.