Matthew 7:15-17
"Beware of the false prophets who come to you in sheep's clothing, but within they are ravening wolves.
John 3:19-21
And this is the condemnation, that Light is come into the world, and men loved darkness rather than light, because their deeds were evil.
2 Corinthians 11:13-15
For such fellows are sham apostles of Christ.
2 Thessalonians 2:9-11
even he whose coming is according to the energy of Satan, in every power and sign and lying wonder,
2 Timothy 4:3-4
For a time will come when they will not listen to wholesome teaching, but wanting to have their ears tickled, they will heap up for themselves teachers upon teachers to satisfy their own fancies.
2 Peter 2:1-2
But there were false prophets, too, among the people, just as among you also there will be false teachers. These will secretly bring in destructive sects, denying even the Master who bought them, and bringing swift ruin upon themselves.