'Furnace' in the Bible

And Jehovah said to Moses and to Aaron, Take to yourselves handfuls of ashes of the furnace, and let Moses scatter it toward the heavens before the eyes of Pharaoh.

And they took ashes of the furnace, and stood before Pharaoh; and Moses sprinkled it toward the heavens; and it became boils with blisters breaking out on man and on cattle.

And the whole of mount Sinai smoked, because Jehovah descended on it in fire; and its smoke ascended as the smoke of a furnace; and the whole mountain shook greatly.