Leviticus 13:55
And the priest shall look on it after the plague has been washed; and if it appears that the plague has not changed its colour, even if the plague is not spread, it is unclean; thou shalt burn it in the fire; it is fret inward, whether the bare spot is within or without.
Ezekiel 24:13
In thy perverse filthiness thou shalt die because I have cleansed thee, and thou didst not cleanse thyself from thy uncleanness; thou shalt never cleanse thyself again, until I have caused my fury to rest upon thee.
Hebrews 6:4-8
For it is impossible that those who once received the light and tasted of that heavenly gift and were made partakers of the Holy Spirit
2 Peter 1:9
But he that lacks these things is blind and walks feeling the way with his hand, having forgotten that he was purged from his old sins.
2 Peter 2:20-22
Certainly, if having separated themselves from the contaminations of the world, by the knowledge of the Lord and Saviour Jesus Christ, they again entangle themselves therein and are overcome, their latter end is made worse for them than the beginnings.