Matt 7:15-16
"Watch out for
false prophets.
They come to you in sheep's clothing, but inwardly they are ferocious wolves.
Matt 23:27-28
27 "Woe to you, teachers of the law and Pharisees, you hypocrites! You are like whitewashed tombs, which look beautiful on the outside but on the inside are full of dead men's bones and everything unclean. 28 In the same way, on the outside you appear to people as righteous but on the inside you are full of hypocrisy and wickedness.
Matt 23:33-34
33 "You snakes! You brood of vipers! How will you escape being condemned to hell?
John 8:41-45
"We are not illegitimate children," they protested. "The only Father we have is God himself."
42 Jesus said to them, "If God were your Father, you would love me, for I came from God and now am here. I have not come on my own; but he sent me.
43 Why is my language not clear to you? Because you are unable to hear what I say.
44 You belong to your father, the devil, and you want to carry out your father's desire. He was a murderer from the beginning, not holding to the truth, for there is no truth in him. When he lies, he speaks his native language, for he is a liar and the father of lies.
Acts 20:29-31
I know that after I leave,
savage wolves will come in among you and will not spare the flock.
30 Even from your own number men will arise and distort the truth in order to draw away disciples after them. 31 So be on your guard!
1 Cor 5:9-13
I have written you in my letter not to associate with sexually immoral people—
10 not at all meaning the people of this world who are immoral, or the greedy and swindlers, or
idolaters. In that case you would have to leave this world.
11 But now I am writing you that
you must not associate with anyone who calls himself a brother but is sexually immoral or greedy,
an idolater or a slanderer, a drunkard or a swindler. With such a man do not even eat.
12 What business is it of mine to judge those outside the church? Are you not to judge those inside?
13 God will judge those outside. "
Expel the wicked man from among you."
2 Cor 11:13-15
For such men are false apostles, deceitful workmen, masquerading as apostles of Christ.
14 And no wonder, for Satan himself masquerades as an angel of light.
15 It is not surprising, then, if his servants masquerade as servants of righteousness. Their end will be what their actions deserve.
1 Tim 6:3-5
If anyone teaches false doctrines and does not agree to the sound instruction of our Lord Jesus Christ and to godly teaching,
4 he is conceited and understands nothing. He has an unhealthy interest in controversies and quarrels about words that result in envy, strife, malicious talk, evil suspicions
5 and constant friction between men of corrupt mind, who have been robbed of the truth
2 Tim 2:14-17
Keep reminding them of these things. Warn them before God against quarreling about words; it is of no value, and only ruins those who listen.
15 Do your best to present yourself to God as one approved, a workman who does not need to be ashamed and who correctly handles the word of truth.
16 Avoid godless chatter, because those who indulge in it will become more and more ungodly.
17 Their teaching will spread like gangrene.
2 Peter 2:1-3
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.
2 Many will follow their shameful ways and will bring the way of truth into disrepute.
3 In their greed these teachers will exploit you with stories they have made up. Their condemnation has long been hanging over them, and their destruction has not been sleeping.
1 John 4:1-3
Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many
false prophets have gone out into the world.
2 This is how you can recognize the Spirit of God: Every spirit that acknowledges that Jesus Christ has come in the flesh is from God,
3 but every spirit that does not acknowledge Jesus is not from God.
This is the spirit of the antichrist, which you have heard is coming and even now is already in the world.
Jude 3-4
I felt I had to write and urge you to contend for the faith that was once for all entrusted to the saints.
4 For certain men whose condemnation was written about long ago have secretly slipped in among you.
They are godless men, who change the grace of our God into a license for immorality and deny Jesus Christ our only Sovereign and Lord.
Jude 12-13
These men are blemishes at your love feasts, eating with you without the slightest qualm —
shepherds who feed only themselves. They are clouds without rain, blown along by the wind; autumn trees, without fruit and uprooted — twice dead.
13 They are wild waves of the sea, foaming up their shame; wandering stars, for whom blackest darkness has been reserved forever.
2 John 7-11
Many deceivers, who do not acknowledge Jesus Christ as coming in the flesh, have gone out into the world
. Any such person is the deceiver and the antichrist.
8 Watch out that you do not lose what you have worked for, but that you may be rewarded fully.
9 Anyone who runs ahead and does not continue in the teaching of Christ does not have God; whoever continues in the teaching has both the Father and the Son.
10 If anyone comes to you and does not bring this teaching, do not take him into your house or welcome him.
11 Anyone who welcomes him shares in his wicked work.
hope this helps !!!