the Holy Qur'an

"Bring me blocks of iron." At length, when he had filled up the space between the two steep mountain-sides, He said, "Blow (with your bellows)" Then, when he had made it (red) as fire, he said: "Bring me, that I may pour over it, molten lead." (18:96)

Thus were they made powerless to scale it or to dig through it. (18:97)

End of Quotes