The word(s) "molten" appears 4 time(s) in 4 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) "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."

(2) And to Solomon (We made) the Wind (obedient): Its early morning (stride) was a month's (journey), and its evening (stride) was a month's (journey); and We made a Font of molten brass to flow for him; and there were Jinns that worked in front of him, by the leave of his Lord, and if any of them turned aside from our command, We made him taste of the Penalty of the Blazing Fire.

(3) Like molten brass; it will boil in their insides.

(4) The Day that the sky will be like molten brass,