Revelation 14:10-11

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). [Gen 19:24; Jer 25:15, 16; Luke 12:9] And the smoke of their torment ascends forever and ever; and they have no rest day and night—those who worship the beast and his image, and whoever receives the mark of his name.” [Is 34:10; Mark 9:48]