Titus 1:16
They profess to know God, but by their actions they disown Him; they are detestable, disobedient, and useless for anything good.
Hebrews 12:23
to the festal gathering and assembly of God's firstborn sons enrolled as citizens in heaven, to a Judge who is the God of all, to the spirits of upright men who have attained perfection,
2 Peter 2:1
Now there were false prophets among the people, just as there will be false teachers among you too, who will insidiously introduce destructive heresies and deny the Master who has bought them, thus bringing on themselves swift destruction.
1 John 2:23
No one who disowns the Son can have the Father. Whoever owns the Son has the Father too.
Jude 1:4
For certain persons have sneaked in -- their doom was written down long ago -- godless persons, who turn the favor of our God into an excuse for licentiousness, and disown our only Master and Lord, Jesus Christ.