Mark 9:48-49
where the worm dieth not, and the fire is not quenched.
Hebrews 6:4-8
For it is not possible to renew again unto repentance those who have been once illuminated, and have tasted the celestial gift, and have been made partakers of the Holy Ghost,
Hebrews 10:26-31
For if we sin wilfully after we have received the knowledge of the truth, no more sacrifice for sins remaineth;
2 Peter 2:19-22
Preaching liberty to them, while they themselves are the slaves of corruption: for by whatever a man is overcome, by that also he is enslaved.
Revelation 21:8
But to those who shrink back through fear, and to the infidels, and to the abominable, and to murderers, and to whoremongers, and to those who use magical incantations, and to idolaters, and to all liars, is their portion [appointed] in the lake which burneth with fire and brimstone; which is the second death.
Revelation 22:11
He that is unjust, let him be unjust still; and he that is filthy, let him be filthy still; and he that is righteous, let him be righteous still; and he that is holy, let him be holy still.