Summary: 5 verses that may be about this
Psalms 69:28 May they be blotted out of the book of life And may they not be recorded with the righteous.
Galatians 5:4 You have been severed from Christ, you who are seeking to be justified by law; you have fallen from grace.
Hebrews 6: 4 For in the case of those who have once been enlightened and have tasted of the heavenly gift and have been made partakers of the Holy Spirit, 5 and have tasted the good word of God and the powers of the age to come, 6 and then have fallen away, it is impossible to renew them again to repentance, since they again crucify to themselves the Son of God and put Him to open shame.
Hebrews 10:26 For if we go on sinning willfully after receiving the knowledge of the truth, there no longer remains a sacrifice for sins,
2 Peter 2:1 But false prophets also arose among the people, just as there will also be false teachers among you, who will secretly introduce destructive heresies, even denying the Master who bought them, bringing swift destruction upon themselves.