Matthew 7:15
Beware of false prophets, who to outward appearance are sheep, but inwardly they are ravenous wolves.
2 Corinthians 11:13-15
for these are false apostles, deceitful workmen, disguised so as to pass for true apostles.
Galatians 1:8-9
but tho' I, or an angel from heaven should preach any thing to you for gospel, different from the gospel I have preached unto you, let him be accursed.
1 John 4:1
Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.
Romans 1:21
because when they knew God, they did not with gratitude glorify him as God, but their reasoning became extravagance, and their minds, void of judgment, were involv'd in darkness.