Leviticus 13:55
And the priest shall look on the plague after it is washed, and behold, if the plague has not changed its color and the plague has not spread; it is unclean. You shall burn it in the fire. It is eaten away in its inside or in its outside.
Ezekiel 24:13
In your defilement is wickedness. Because I have purged you and you were not purged, you shall not be purged from your defilement any more, until I have caused My fury to cease on you.
Hebrews 6:4-8
For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Spirit,
2 Peter 1:9
For he in whom these things are not present is blind and cannot see afar off and has forgotten that he was purged from his sins in the past.
2 Peter 2:20-22
For if they have escaped the pollutions of the world through the full knowledge of the Lord and Savior Jesus Christ, and are again entangled, they have been overcome by these, their last things are worse than the first.