'Brimstone' in the Bible

And this is how I saw the horses and their riders in my vision: the riders had breastplates [the color] of fire and of hyacinth (sapphire blue) and of brimstone (yellow); and the heads of the horses looked like the heads of lions; and from out of their mouths came fire and smoke and brimstone (burning sulfur).

A third of mankind was killed by these three plagues—by the fire and the smoke and the brimstone that came from the mouths of the horses.

he too will [have to] drink of the wine of the wrath of God, mixed undiluted into the cup of His anger; and he will be tormented with fire and brimstone (flaming sulfur) in the presence of the holy angels and in the presence of the Lamb (Christ).

And the beast (Antichrist) was seized and overpowered, and with him the false prophet who, in his presence, had performed [amazing] signs by which he deceived those who had received the mark of the beast and those who worshiped his image; these two were hurled alive into the lake of fire which blazes with brimstone.

And the devil who had deceived them was hurled into the lake of fire and burning brimstone (sulfur), where the beast (Antichrist) and false prophet are also; and they will be tormented day and night, forever and ever.

But as for the cowards and unbelieving and abominable [who are devoid of character and personal integrity and practice or tolerate immorality], and murderers, and sorcerers [with intoxicating drugs], and idolaters and occultists [who practice and teach false religions], and all the liars [who knowingly deceive and twist truth], their part will be in the lake that blazes with fire and brimstone, which is the second death.”