'Brick kiln' in the Bible

Then the Lord said to Moses and Aaron, “Take handfuls of soot from the brick kiln, and let Moses throw it toward the sky in the sight of Pharaoh.

He also brought out the people who were there, and put them to [work with] the saws and sharp iron instruments and iron axes, and made them work at the brickkiln. And he did this to all the Ammonite cities. Then David and all the men returned to Jerusalem.

Draw water for a [long, continued] siege!Strengthen your fortresses!Go down to the clay pits, trample the mortar!Prepare the brick kiln [to burn bricks for the rampart]!