2PE 2:1

1 But there were also nevi'ei sheker [(false prophets)] among Am Yisroel just as also there will be morei sheker among you. These false teachers will secretly bring in heretical doctrines of koferim ba-ikkarim [(deniers of fundamentals)], producing machshelah [(ruin)], as these heretics even become meshummad, denying the Ribbono Shel Olam who redeemed them, bringing upon themselves swift destruction.