'Furnace' in the Bible

And Yahweh said to Moses and to Aaron, "Take for yourselves full handfuls of soot from a smelting furnace, and let Moses sprinkle it toward the heavens before the eyes of Pharaoh.

And they took the soot of the smelting furnace, and they stood before Pharaoh, and Moses sprinkled it toward the heavens, and it became skin sores sprouting blisters on humans and on animals.

And Mount Sinai was all wrapped in smoke because Yahweh went down on it in the fire, and its smoke went up like the smoke of a smelting furnace, and the whole mountain trembled greatly.