Bible Verses About heresy

Forasmuch as we have heard, that certain which went out from us have troubled you with words, subverting your souls, saying, Ye must be circumcised, and keep the law: to whom we gave no such commandment:

For if he that cometh preacheth another Jesus, whom we have not preached, or if ye receive another spirit, which ye have not received, or another gospel, which ye have not accepted, ye might well bear with him.

Which is not another; but there be some that trouble you, and would pervert the gospel of Christ.

But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.

Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness,

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

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.

Which have forsaken the right way, and are gone astray, following the way of Balaam the son of Bosor, who loved the wages of unrighteousness;

Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.

If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed:

For he that biddeth him God speed is partaker of his evil deeds.