Treasury of Scripture Knowledge
"Beware of the false teachers--men who come to you in sheep's fleeces, but beneath that disguise they are ravenous wolves.
For there will rise up false Christs and false prophets, displaying wonderful signs and prodigies, so as to deceive, were it possible, even God's own People.
and that from among your own selves men will rise up who will seek with their perverse talk to draw away the disciples after them.
For men of that stamp are not bondservants of Christ our Lord, but are slaves to their own appetites; and by their plausible words and their flattery they utterly deceive the minds of the simple.
So we shall no longer be babes nor shall we resemble mariners tossed on the waves and carried about with every changing wind of doctrine according to men's cleverness and unscrupulous cunning, making use of every shifting device to mislead.
2 Timothy 3:5
and will keep up a make-believe of piety and yet live in defiance of its power. Turn away from people of this sort.
2 Peter 2:1
But there were also false prophets among the people, as there will be teachers of falsehood among you also, who will cunningly introduce fatal divisions, disowning even the Sovereign Lord who has redeemed them, and bringing on themselves swift destruction.
For they are the spirits of demons working marvels--spirits that go out to control the kings of the whole earth, to assemble them for the battle which is to take place on the great day of God, the Ruler of all.
And just as they had refused to continue to have a full knowledge of God, so it was to utterly worthless minds that God gave them up, for them to do things which should not be done.
Such men being past feeling have abandoned themselves to impurity, greedily indulging in every kind of profligacy.