'Furnace' in the Bible

“Son of man, the house of Israel has become dross to Me. All of them are copper, tin, iron, and lead inside the furnace; they are the dross of silver.

Just as one gathers silver, copper, iron, lead, and tin into the furnace to blow fire on them and melt them, so I will gather you in My anger and wrath, put you inside, and melt you.

As silver is melted inside a furnace, so you will be melted inside the city. Then you will know that I, Yahweh, have poured out My wrath on you.”