1400 years ago Arabs burned wood for fire however they didn't know about stones that burn.
What is Coal?
Coal is an organic sedimentary rock that forms from the accumulation and preservation of plant materials, usually in a swamp environment. Coal is a combustible rock and, along with oil and natural gas, it is one of the three most important fossil fuels. Coal has a wide range of uses; the most important use is for the generation of electricity.
"Coal is a combustible rock" however it was not known to Arabs 1400 years ago. But combustible rocks is portrayed in the Quran.
But if you do not-and you will not-then beware the Fire whose fuel is people and stones, prepared for the disbelievers.
٢٤ فَإِنْ لَمْ تَفْعَلُوا وَلَنْ تَفْعَلُوا فَاتَّقُوا النَّارَ الَّتِي وَقُودُهَا النَّاسُ وَالْحِجَارَةُ ۖ أُعِدَّتْ لِلْكَافِرِينَ
Stones that are fuel for fire, which means they are combustible stone. Today we know that coal is combustible stone.
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