Hebrews 10:26-27, Hebrews 6:6 Nasb

2 Peter 2:21 NIV
It would have been better for them not to have known the way of righteousness, than to have known it and then to turn their backs on the sacred command that was passed on to them.

Hebrews 10:29 NIV
How much more severely do you think someone deserves to be punished who has trampled the Son of God underfoot, who has treated as an unholy thing the blood of the covenant that sanctified them, and who has insulted the Spirit of grace?