Hebrews 6:4-8
For it is impossible, in the case of those who have once for all been enlightened, and have tasted the sweetness of the heavenly gift, and have been made partakers of the Holy Spirit,
2 Peter 2:20
For if, after escaping from the pollutions of the world through a full knowledge of our Lord and Saviour Jesus Christ, people are once more entangled in these pollutions and are overcome, their last state has become worse than their first.
2 Peter 2:22
Their case is that described in the true proverb, "A dog returns to what he has vomited," and also in the other proverb, "The sow has washed itself and now goes back to roll in its filth."
Jude 1:12
These men--sunken rocks! --are those who share the pleasure of your love-feasts, unrestrained by fear while caring only for themselves; clouds without water, driven away by the winds; trees that cast their fruit, barren, doubly dead, uprooted;