5 Bible Verses about Heresy

I know your works, your labor, and your endurance, and that you cannot tolerate evil. You have tested those who call themselves apostles and are not, and you have found them to be liars.

Because we have heard that some without our authorization went out from us and troubled you with their words and unsettled your hearts,

not that there is another gospel, but there are some who are troubling you and want to change the good news about the Messiah.

For if a person comes and preaches another Jesus, whom we did not preach, or you receive a different spirit, which you had not received, or a different gospel, which you had not accepted, you put up with it splendidly!

This issue arose because of false brothers smuggled in, who came in secretly to spy on the freedom that we have in Christ Jesus, in order to enslave us.

Reject a divisive person after a first and second warning, knowing that such a person is perverted and sins, being self-condemned.

If anyone comes to you and does not bring this teaching, do not receive him into your home, and don't say, "Welcome," to him; for the one who says, "Welcome," to him shares in his evil works.

And bringing them before the chief magistrates, they said, "These men are seriously disturbing our city. They are Jews, and are promoting customs that are not legal for us as Romans to adopt or practice."

After they had inflicted many blows on them, they threw them in jail, ordering the jailer to keep them securely guarded.

Neither can they provide evidence to you of what they now bring against me. But I confess this to you: that according to the Way, which they call a sect, so I worship my fathers' God, believing all the things that are written in the Law and in the Prophets. And I have a hope in God, which these men themselves also accept, that there is going to be a resurrection, both of the righteous and the unrighteous. read more.
I always do my best to have a clear conscience toward God and men.

“This man,” they said, “persuades people to worship God contrary to the law!”