Matthew 7:15
"Look out for false prophets, who come to you under the guise of sheep, but inside they are devouring wolves.
Matthew 24:11
Many false prophets will appear and mislead many people;
Matthew 24:24
for false Christs and false prophets will announce themselves, and they will show great signs and wonders to mislead, if possible, God's chosen people.
2 Timothy 3:8
Just as Jannes and Jambres resisted Moses, these people resist the truth, for they are depraved in mind and so counterfeits in the faith.
2 Timothy 4:14-15
Alexander, a worker in metal, did me ever so much harm. The Lord will repay him for what he did.
1 John 5:16
If anyone sees his brother committing a sin that does not lead to death, he will ask and God will grant him life; yea, He will grant it to any who do not commit a sin that leads to death. There is a sin that leads to death; I do not say that one should pray for that.
Revelation 19:20
Then the wild beast was captured and with him the false prophet who performed wonders in his presence, by which he led astray those who let the mark of the wild beast be put on them and worshiped his statue. Both of them were hurled alive into the fiery lake that burns with brimstone.