2PE 2:1

1 Just like there were false prophets among the [Israeli] people [long ago], so there will also be teachers who teach false [things] among you. They will enter [your congregations] without you realizing [what/who they are], and they will [spiritually] injure some people by what they teach. Specifically, these teachers will even deny [that] the Lord [Jesus died to] pay [for the guilt of our sins]. As a result, they will soon destroy themselves [spiritually, and God will also punish them].