Hebrews 6:4-8   4. For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost, 5. And have tasted the good word of God, and the powers of the world to come, 6. If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame. 7. For the earth which drinketh in the rain that cometh oft upon it, and bringeth forth herbs meet for them by whom it is dressed, receiveth blessing from God: 8. But that which beareth thorns and briers is rejected, and is nigh unto cursing; whose end is to be burned.

Hebrews 10:26-31   26. For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins, 27. But a certain fearful looking for of judgment and fiery indignation, which shall devour the adversaries. 28. He that despised Moses' law died without mercy under two or three witnesses: 29. Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done despite unto the Spirit of grace? 30. For we know him that hath said, Vengeance belongeth unto me, I will recompense, saith the Lord. And again, The Lord shall judge his people. 31. It is a fearful thing to fall into the hands of the living God.

2 Peter 2:20-22   20. For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning. 21. For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered unto them. 22. But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.