'Coal' in the Bible

Now behold, the entire family has risen against your maidservant, and they say, ‘Hand over the one who killed his brother, so that we may put him to death [to pay] for the life of his brother whom he killed and destroy the heir also.’ By doing this they will extinguish my coal that is left, leaving my husband without a name or a remnant (heir) on the face of the earth.”

Then one of the seraphim flew to me with a burning coal in his hand, which he had taken from the altar with tongs.

“In fact, they are like stubble;Fire burns them.They cannot save themselves from the power of the flame [much less save the nation],There is no blazing coal for warmingNor fire before which to sit!