'Cast into the Fire' in the Bible

Let burning coals fall upon them: let them be cast into the fire; into deep pits, that they rise not up again.

And it will be as Jehudi read three columns and four, he will rend it with the knife of the scribe, and cast into the fire which was in the furnace, even till all the roll was consumed upon the fire which was upon the furnace.

Behold, it is cast into the fire for fuel; the fire devoureth both the ends of it, and the midst of it is burned. Is it meet for any work?