Hebrews 6:4-8
For it is impossible that those having been once enlightened, and tasted the heavenly gift, and have been made partakers of the Holy Ghost,
2 Peter 2:20
For if having escaped the pollutions of the world through the perfect knowledge of our Lord and Saviour Jesus Christ, and having again become entangled in these things, they are overcome, the last state has to them become worse than the first.
2 Peter 2:22
It has happened unto them according to the old proverb, The dog having returned to his own vomit; and the sow that had washed to wallowing in the mire.
Jude 1:12
These are rocks in your love-feasts, feasting along with you without fear shepherdizing themselves, clouds without water, driven away by the winds; withered trees, without fruit, twice dead, plucked up by the roots;