Matthew 7:15-17
Beware of false prophets, who to outward appearance are sheep, but inwardly they are ravenous wolves.
John 3:19-21
and this is the subject of their condemnation, that light is come into the world, and men have loved darkness rather than light, because their deeds were evil.
2 Corinthians 11:13-15
for these are false apostles, deceitful workmen, disguised so as to pass for true apostles.
2 Thessalonians 2:9-11
who by the instigation of satan will make his parade with various arts, with fallacious signs and prodigies,
2 Timothy 4:3-4
for the time will come, when they will not endure sound doctrine, but get teachers of their own corrupt taste, to sooth their ears that itch for flattery:
2 Peter 2:1-2
As there were false prophets among the people of Israel, there will likewise be false doctors among you, who by introducing pernicious sects, and by renouncing the Lord, who bought them, will bring upon themselves swift destruction.