5 Bible Verses about Heresy

I know about your deeds, your hard work and your perseverance. [I know] that you cannot tolerate wicked men and that you have tested those who call themselves apostles, but really are not, and found them to be liars.

We have heard that certain [men] who left here have been upsetting you people and [even] undermining [some people's] spiritual lives by what they have been teaching. This was done without our authorization [or approval].

although it is really not a different one, but rather some people are causing you trouble by trying to pervert the [true] Gospel of Christ.

For if someone comes [to you] proclaiming another "Jesus," whom we [apostles] had not preached, or if you people receive a different "spirit" from the one you have [already] received, or a different "gospel" from the one you have [already] accepted, you put up with him quite well.

For [certain] false brothers, who were secretly brought in to observe us practicing our liberty in Christ Jesus [i.e., by not having Titus circumcised], attempted to place us [back] under the bondage [of Mosaic law keeping].

After you have warned a divisive person twice, have nothing more to do with him [i.e., withdraw spiritual fellowship from him]. You can be sure that such a person is [spiritually] corrupt and sinful, and that he is condemned by his own actions.

If anyone comes to you [i.e., to your meetings] who does not bring this teaching [about Christ], you should not welcome him into your home or give him [any] greetings [i.e., suggesting approval or endorsement]. For the person who greets him [with approval] participates in his evil deeds [i.e., in his false teaching].

And when they brought them before the city officials, they made this charge [against them]: "These Jewish men are causing too much trouble in our city, and they are teaching people to observe customs which we Romans are not permitted to accept or practice."

After beating them severely, they threw them in jail and ordered the jailor to have them securely guarded.

Neither can anyone prove to you the charges they are now bringing against me. But, I declare to you, I am serving the God of our forefathers according to the 'Way,' called [by my detractors] a sect, and I believe everything that is in harmony with the law of Moses and what is written in [the writings of] the prophets. I have a hope in God that there will be a resurrection both for those who have done right and those who have done wrong, just as the Jews themselves also expect. read more.
So, for this reason I make every effort to have a clear conscience before God and men at all times.

and said [about him], "This man is persuading people to worship God contrary to the law [of Moses]."