2 Peter 2
2 Peter 2: But there were also false prophets among the people, just as there will be false teachers among you. They will secretly introduce destructive heresies, even denying the sovereign Lord who bought them—bringing swift destruction on themselves.
Did you note the verb tenses used by Peter? There “were” (past) but there “will be” (future) false prophets. Like Jesus, Paul and other inspired writer in the New Testament Peter warns against false teachers. And I think the severity of Peter’s condemnation of false teachers is a stark warning on how alert we must always be to ensure they never remain part of the Body.