1 Corinthians 3:17
If any one is marring the Sanctuary of God, him will God mar; for the Sanctuary of God is holy, which you all are.
Hebrews 10:29
How much severer punishment, think you, will he be held to deserve who has trampled under foot the Son of God, has not regarded as holy that Covenant-blood with which he was set free from sin, and has insulted the Spirit from whom comes grace?
Hebrews 12:14-15
but may rather be restored. Persistently strive for peace with all men, and for that growth in holiness apart from which no one will see the Lord.
Jude 1:4
For certain persons have crept in unnoticed--men spoken of in ancient writings as pre-destined to this condemnation--ungodly men, who pervert the grace of our God into an excuse for immorality, and disown Jesus Christ, our only Sovereign and Lord.