'Coal' in the Bible

Then flew one of the seraphims unto me, having a live coal in his hand, which he had taken with the tongs from off the altar:

He touched my mouth with it and said, "Look, this coal has touched your lips. Your evil is removed; your sin is forgiven."

It shatters in pieces like a clay jar, so shattered to bits that none of it can be salvaged. Among its fragments one cannot find a shard large enough to scoop a hot coal from a fire or to skim off water from a cistern."

Behold, they shall be as stubble; the fire shall burn them; they shall not deliver themselves from the power of the flame: there shall not be a coal to warm at, nor fire to sit before it.

Behold, it is I who have created the smith that bloweth in the fire of coal, and that bringeth forth an instrument for his work; and I have created the destroyer to ravage.