Stones and effusion of the kuffar are the main fuel of the Fire.Alah says: ´´O you who believe! Ward off from yourselves and your families a Fire (Hell) whose fuel is men and stones, over which are (appointed) angels stern (and) severe, who disobey not, (from executing) the commands they receive from Allah, but do that which they are commanded.++ (At-Tahreem: 6) He also says: ´´Then fear the Fire (Hell) whose fuel is men and stones, prepared for the disbelievers.´´ (Al-Baqarah: 24) The intimidation in this is not obscured since the Fire will be fulled and kindled by these things. The stones that will be fuel for the Fire are from the black brimstones in the Hellfire and other types of hot and combustible stones. Among the fuel for the Fire are the idols which were worshipped besides Allah. Allah says: ´´Vertainly! You (disbelievers) and that which you are worshipping now besides Allah, are (but) fuel for Hell! (Surely), you will enter it. Had these (idols, etc.) been aliha (gods),...