Matthew 7:15
But beware of false prophets, who come to you in sheeps clothing, but inwardly they are ravenous wolves.
2 Corinthians 11:13-15
For such are false apostles, deceitful workers, transforming themselves into apostles of Christ.
Galatians 1:8-9
But if we or an angel from heaven preach to you another gospel than we have preached to 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 knowing God, they did not glorify him as God, neither were thankful, but became vain in their reasonings, and their foolish heart was darkened.