1 Corinthians 11:19

They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.

A man that is an heretick after the first and second admonition reject;

Also of your own selves shall men arise, speaking perverse things, to draw away disciples after them.

Thou shalt not hearken unto the words of that prophet, or that dreamer of dreams: for the Lord your God proveth you, to know whether ye love the Lord your God with all your heart and with all your soul.

Then said he unto the disciples, It is impossible but that offences will come: but woe unto him, through whom they come!

Woe unto the world because of offences! for it must needs be that offences come; but woe to that man by whom the offence cometh!

But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction. And many shall follow their pernicious ways; by reason of whom the way of truth shall be evil spoken of.

Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils; Speaking lies in hypocrisy; having their conscience seared with a hot iron;

Examine yourselves, whether ye be in the faith; prove your own selves. Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates? But I trust that ye shall know that we are not reprobates. Now I pray to God that ye do no evil; not that we should appear approved, but that ye should do that which is honest, though we be as reprobates.

Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies,

But there rose up certain of the sect of the Pharisees which believed, saying, That it was needful to circumcise them, and to command them to keep the law of Moses.

But this I confess unto thee, that after the way which they call heresy, so worship I the God of my fathers, believing all things which are written in the law and in the prophets:

For we have found this man a pestilent fellow, and a mover of sedition among all the Jews throughout the world, and a ringleader of the sect of the Nazarenes:

Which knew me from the beginning, if they would testify, that after the most straitest sect of our religion I lived a Pharisee.

But we desire to hear of thee what thou thinkest: for as concerning this sect, we know that every where it is spoken against.

Then the high priest rose up, and all they that were with him, (which is the sect of the Sadducees,) and were filled with indignation,

(Yea, a sword shall pierce through thy own soul also,) that the thoughts of many hearts may be revealed.