Heresy: The Propagation of, Forbidden Under Severe Penalties
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Deuteronomy 13:1
If a prophet or dreamer of dreams arises among you and proclaims a sign or wonder to you,
Titus 3:10, 11
Reject a divisive man after a first and second admonition, / knowing that such a man is corrupt and sinful; he is self-condemned.
2 John 1:10, 11
If anyone comes to you but does not bring this teaching, do not receive him into your home or even greet him. / Whoever greets such a person shares in his evil deeds.