Bible Verses About Heresy: The Propagation of, Forbidden Under Severe Penalties

If there arise among you a prophet, or a dreamer of dreams, and giveth thee a sign or a wonder,

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

Knowing that he that is such is subverted, and sinneth, being condemned of himself.

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.