Surah 56. Al-Waqia, Ayah 72

Lit., "its tree": a metonym pointing to the plant-origin, direct or indirect, of almost all the known fuels, including mineral fuels like coal, which is but petrified wood, or petroleum, which is a liquefied residue of plant-nourished organisms buried in the earth for millions of years.

The relation of Fire to Trees is intimate. In nearly all the fire that we burn, the fuel is derived from the wood of trees. Even mineral coal is nothing but the wood of prehistoric forests petrified under the earth through geological ages. Fire produced out of green trees is referred to in xxxvi. 80; and n. 4026 there gives instances.