Matthew 7:15
Beware of false Teachers--men who come to you in the guise of sheep, but at heart they are ravenous wolves.
Matthew 24:11
Many false Prophets, also, will appear and lead many astray;
Matthew 24:24
For false Christs and false Prophets will arise, and will display great signs and marvels, so that, were it possible, even God's People would be led astray.
2 Timothy 3:8
Just as Jannes and Jambres opposed Moses, so do these people, in their turn, oppose the Truth. Their minds are corrupted, and, as regards the Faith, they are utterly worthless.
2 Timothy 4:14-15
Alexander, the coppersmith, showed much ill-feeling towards me. 'The Lord will give him what his actions deserve.'
1 John 5:16
If any one sees his Brother committing some sin that is not a deadly sin, he will ask, and so be the means of giving Life to him--to any whose sin is not deadly. There is such a thing as deadly sin; about that I do not say that a man should pray.
Revelation 19:20
The Beast was captured, and with him was taken the false Prophet, who performed the marvels before the eyes of the Beast, with which he deceived those who had received the brand of the Beast and those who worshiped his image. Alive, they were thrown, both of them, into the fiery lake 'of burning sulphur.'