'Furnace' in the Bible

When I turn my attention to you, I'll refine your dross as in a furnace. I'll remove all your alloy.

Their stronghold will vanish by reason of terror, and their commanders will be filled with alarm because of the battle standard," declares the LORD, whose fire is in Zion and whose furnace is in Jerusalem.

Look, I have refined you, but not like silver; I have purified you in the furnace of affliction.