Hebrews 6:4-8
For it is impossible to renew again to repentance those who have once been enlightened, and have tasted of the heavenly gift, and have been made partakers of the Holy Spirit,
2 Peter 2:20
For if, after they have escaped the pollutions of the world, through the knowledge of the Lord and Savior Jesus Christ, they are again entangled in these, and overcome by them, the last state of such is worse than the first.
2 Peter 2:22
But it has happened to them according to the true proverb: The dog has turned again to his own vomit; and, The sow that was washed, to her wallowing in the mire.
Jude 1:12
These, while feasting with you, are- spots in your love-feasts, feeding themselves without fear; they are clouds without water, driven along by winds; trees of autumn, without fruit, twice dead, torn up by the roots: -