'Sulfur' in the Bible

Thus I saw the horses in the vision, and those who sat on them, having breastplates of fiery red, hyacinth blue, and sulfur yellow; and the heads of lions. Out of their mouths proceed fire, smoke, and sulfur.

By these three plagues were one third of mankind killed: by the fire, the smoke, and the sulfur, which proceeded out of their mouths.

he also will drink of the wine of the wrath of God, which is prepared unmixed in the cup of his anger. He will be tormented with fire and sulfur in the presence of the holy angels, and in the presence of the Lamb.

The beast was taken, and with him the false prophet who worked the signs in his sight, with which he deceived those who had received the mark of the beast and those who worshiped his image. These two were thrown alive into the lake of fire that burns with sulfur.

The devil who deceived them was thrown into the lake of fire and sulfur, where the beast and the false prophet are also. They will be tormented day and night forever and ever.

But for the cowardly, unbelieving, sinners, abominable, murderers, sexually immoral, sorcerers, idolaters, and all liars, their part is in the lake that burns with fire and sulfur, which is the second death."