Bible Verses About Heresy: Propagandism of, forbidden under severe penalties

Reiect him that is an heretike, after once or twise admonition,

Knowing that hee that is such, is peruerted, and sinneth, being damned of his owne selfe.

If there come any vnto you, and bring not this doctrine, receiue him not to house, neither bid him, God speede:

For he that biddeth him, God speede, is partaker of his euill deedes. Although I had many things to write vnto you, yet I woulde not write with paper and ynke: but I trust to come vnto you, and speake mouth to mouth, that our ioy may be full.