2 Peter 2:1-3 NKJV
But there were also false prophets among the people, even as there will be false teachers among you, who will secretly bring in destructive heresies, even denying the Lord who bought them, and bring on themselves swift destruction.  And many will follow their destructive ways, because of whom the way of truth will be blasphemed.  By covetousness they will exploit you with deceptive words; for a long time their judgment has not been idle, and their destruction does not slumber.
Matthew 7:13-15 NKJV
“Enter by the narrow gate; for wide is the gate and broad is the way that leads to destruction, and there are many who go in by it.  Because narrow is the gate and difficult is the way which leads to life, and there are few who find it.  “Beware of false prophets, who come to you in sheep’s clothing, but inwardly they are ravenous wolves.
Matthew 24:23-27 NKJV
“Then if anyone says to you, ‘Look, here is the Christ!’ or ‘There!’ do not believe it.  For false christs and false prophets will rise and show great signs and wonders to deceive, if possible, even the elect.  See, I have told you beforehand.  “Therefore if they say to you, ‘Look, He is in the desert!’ do not go out; or ‘Look, He is in the inner rooms!’ do not believe it.  For as the lightning comes from the east and flashes to the west, so also will the coming of the Son of Man be.
Mark 13:22-23 NKJV
For false christs and false prophets will rise and show signs and wonders to deceive, if possible, even the elect.  But take heed; see, I have told you all things beforehand.
1 John 4:1-6 NKJV
Beloved, do not believe every spirit, but test the spirits, whether they are of God; because many false prophets have gone out into the world.  By this you know the Spirit of God: Every spirit that confesses that Jesus Christ has come in the flesh is of God,  and every spirit that does not confess that Jesus Christ has come in the flesh is not of God. And this is the spirit of the Antichrist, which you have heard was coming, and is now already in the world.  You are of God, little children, and have overcome them, because He who is in you is greater than he who is in the world.  They are of the world. Therefore they speak as of the world, and the world hears them.  We are of God. He who knows God hears us; he who is not of God does not hear us. By this we know the spirit of truth and the spirit of error.
2 John 1:7-11 NKJV
For many deceivers have gone out into the world who do not confess Jesus Christ as coming in the flesh. This is a deceiver and an antichrist.  Look to yourselves, that we do not lose those things we worked for, but that we may receive a full reward.  Whoever transgresses and does not abide in the doctrine of Christ does not have God. He who abides in the doctrine of Christ has both the Father and the Son.  If anyone comes to you and does not bring this doctrine, do not receive him into your house nor greet him;  for he who greets him shares in his evil deeds.
2 Timothy 3:1-7 NKJV
But know this, that in the last days perilous times will come:  For men will be lovers of themselves, lovers of money, boasters, proud, blasphemers, disobedient to parents, unthankful, unholy,  unloving, unforgiving, slanderers, without self-control, brutal, despisers of good,  traitors, headstrong, haughty, lovers of pleasure rather than lovers of God,  having a form of godliness but denying its power. And from such people turn away!  For of this sort are those who creep into households and make captives of gullible women loaded down with sins, led away by various lusts,  always learning and never able to come to the knowledge of the truth.
2 Timothy 4:1-5 NKJV
I charge you therefore before God and the Lord Jesus Christ, who will judge the living and the dead at His appearing and His kingdom:  Preach the word! Be ready in season and out of season. Convince, rebuke, exhort, with all longsuffering and teaching.  For the time will come when they will not endure sound doctrine, but according to their own desires, because they have itching ears, they will heap up for themselves teachers;  and they will turn their ears away from the truth, and be turned aside to fables.  But you be watchful in all things, endure afflictions, do the work of an evangelist, fulfill your ministry.