Most Relevant Verses
Beloved, 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.
that is, the one whose coming is in accord with the activity of Satan, with all power and signs and false wonders,
I am amazed that you are so quickly deserting Him who called you by the grace of Christ, for a different gospel;
Do not be carried away by varied and strange teachings; for it is good for the heart to be strengthened by grace, not by foods, through which those who were so occupied were not benefited.
More Verses on Counterfeits
If anyone thinks himself to be religious, and yet does not bridle his tongue but deceives his own heart, this man's religion is worthless.
You ask and do not receive, because you ask with wrong motives, so that you may spend it on your pleasures.
O Timothy, guard what has been entrusted to you, avoiding worldly and empty chatter and the opposing arguments of what is falsely called "knowledge"--
But false prophets also arose among the people, just as there will also be false teachers among you, who will secretly introduce destructive heresies, even denying the Master who bought them, bringing swift destruction upon themselves.
No wonder, for even Satan disguises himself as an angel of light.