Galatians 1:8-9 "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. 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."

2 Corinthians 11:13-15

"For such are false apostles, deceitful workers, transforming themselves into the apostles of Christ.

And no marvel; for Satan himself is transformed into an angel of light.

Therefore it is no great thing if his ministers also be transformed as the ministers of righteousness; whose end shall be according to their works."

2 Timothy 4:1-6

"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."