Leviticus 13:55
And let the priest look on it again after that the plague is washed. If the plague have not changed his fashion though it be spread no further abroad, it is yet unclean. And see that ye burn it in the fire, for it is fretten inward: whether in part or in all together.
Ezekiel 24:13
Thy filthiness is abominable, for I would have cleansed thee, but thou wouldest not be cleansed. Thou canst not be purged from thine uncleanness, till I have poured my wrathful indignation upon thee.
Hebrews 6:4-8
For it is not possible that they which were once lighted, and have tasted of the heavenly gift, and were become partakers of the holy ghost,
2 Peter 1:9
But he that lacketh these things is blind and gropeth for the way with his hand, and hath forgotten that he was purged from his old sins.
2 Peter 2:20-22
For if they, after they have escaped from the filthiness of the world through the knowledge of the Lord, and of the saviour Jesus Christ, they are yet tangled again therein and overcome: then is the latter end worse with them than the beginning.