Take heed to yourselves, and to the whole flock, wherein the Holy Ghost hath placed you bishops, to rule the church of God, which he hath purchased with his own blood. I know that, after my departure, ravening wolves will enter in among you, not sparing the flock. And of your own selves shall arise men speaking perverse things, to draw away disciples after them. Acts 20:28-30
A man that is a heretic, after the first and second admonition, avoid: Knowing that he, that is such an one, is subverted, and sinneth, being condemned by his own judgment. Titus 3:10-11
Whosoever revolteth, and continueth not in the doctrine of Christ, hath not God. He that continueth in the doctrine, the same hath both the Father and the Son. If any man come to you, and bring not this doctrine, receive him not into the house nor say to him, God speed you. For he that saith unto him, God speed you, communicateth with his wicked works. 2 John 1:9-11
Now the Spirit manifestly saith, that in the last times some shall depart from the faith, giving heed to spirits of error, and doctrines of devils, Speaking lies in hypocrisy, and having their conscience seared….” 1 Tim 4:1-2
For there shall be a time, when they will not endure sound doctrine; but, according to their own desires, they will heap to themselves teachers, having itching ears: And will indeed turn away their hearing from the truth, but will be turned unto fables. 2 Tim 4:3-4
But there were also false prophets among the people, even as there shall be among you lying teachers, who shall bring in sects of perdition, and deny the Lord who bought them: bringing upon themselves swift destruction. And many shall follow their riotousnesses, through whom the way of truth shall be evil spoken of. And through covetousness shall they with feigned words make merchandise of you. Whose judgment now of a long time lingereth not, and their perdition slumbereth not. 2 Peter 2:1-3