Here's one about false teachers....
Galatians 1:6-10
6. I marvel that you are turning away so soon from Him who called you in the grace of Christ, to a different gospel,
7. which is not another; but there are some who trouble you and want to pervert the gospel of Christ.
8. But even if we, or an angel from heaven, preach any other gospel to you than what we have preached to you, let him be accursed.
9. As we have said before, so now I say again, if anyone preaches any other gospel to you than what you have received, let him be accursed.
10. For do I now persuade men, or God? Or do I seek to please men? For if I still pleased men, I would not be a bondservant of Christ."
Acts 20:27-31
27. "For I have not hesitated to proclaim to you the whole will of God.
28. Keep watch over yourselves and all the flock of which the Holy Spirit has made you overseers.[a] Be shepherds of the church of God, which he bought with his own blood.
29.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.
[ FALSE TEACHERS ]]
31. So be on your guard! Remember that for three years I never stopped warning each of you night and day with tears. "
and beware of them.....
2 Corinthians 11:12-15
12But what I do, that I will do, that I may cut off occasion from them which desire occasion; that wherein they glory, they may be found even as we.
13For such are false apostles, deceitful workers, transforming themselves into the apostles of Christ.
14And no marvel; for Satan himself is transformed into an angel of light.
15Therefore it is no great thing if his ministers also be transformed as the ministers of righteousness; whose end shall be according to their works.
And do not receive them, bless them, are let them into your house..........................
7. 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.
2John1:7-9
8. Look to yourselves, that we do not lose those things we worked for, but that we may receive a full reward.
9. 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.
10. If anyone comes to you and does not bring this doctrine, do not receive him into your house nor greet him;
11 for he who greets him shares in his evil deeds."
Sounds harsh...but that's the Apostolic attitude toward false teachers. Mark and reject.