Coal. The first and most frequent use of the word rendered coal is a live ember, burning fuel. Proverbs 26:21. In 2 Samuel 22:9; 2 Samuel 22:13, "coals of fire" are put metaphorically, for the lightning, s proceeding from God. Psalms 18:8; Psalms 18:12-13; Psalms 140:10. In Proverbs 26:21, fuel, not yet lighted, is clearly signified. The fuel meant in the above passage is probably charcoal, and not coal in our sense of the word.
More than 4,500 subjects and proper names are defined and analyzed with corresponding Scripture references. Bible students have used "Smith's Bible Dictionary" since its introduction in the 1880s, making it a trustworthy classic.Wikipedia
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