Titus 1:16
They profess to know God, but they deny him by their deeds; they are detestable, disobedient, and useless for good work of any kind.
Hebrews 12:23
to the assembly of the first-born registered in heaven, to the God of all as judge, to the spirits of just men made perfect,
2 Peter 2:1
Still, false prophets did appear among the People, as among you also there will be false teachers, men who will insinuate destructive heresies, even disowning the Lord who ransomed them; they bring rapid destruction on themselves,
1 John 2:23
No one who disowns the Son can possess the Father: he who confesses the Son possesses the Father as well.
Jude 1:4
for certain persons have slipped in by stealth (their doom has been predicted long ago), impious creatures who pervert the grace of our God into immorality and disown our sole liege and Lord, Jesus Christ.