Tafsir of Ar-Rahman 55:15

وَخَلَقَ الْجَانَّ مِن مَّارِ‌جٍ مِّن نَّارٍ‌ (and created Jann [ father of the Jinns ] from a smokeless flame of fire...55:15) The word جَانَّ - jann, refers to the class of beings called jinn'. The word مَّارِ‌جٍ marij refers to the ' smokeless flame of fire'. The major element in the creation of jinn is the smokeless flame of fire, just as the major element in the creation of man is dry sounding clay.