Matthew 7:15
"Beware of false prophets, who, indeed, come to you in sheep's clothing, but within are ravening wolves.
Matthew 24:11
and many false prophets will arise, and will lead many astray;
Matthew 24:24
for there will arise false Christs and false prophets; and they will give great signs and wonders, so as to lead astray, if possible, even the elect.
2 Timothy 3:8
And as Jannes and Jambres withstood Moses, so also do these withstand the truth; men utterly corrupted in mind, disapproved concerning the faith.
2 Timothy 4:14-15
Alexander, the coppersmith, showed me much evil; the Lord will reward him according to his works:
1 John 5:16
If anyone sees his brother sinning a sin not to death, he shall ask, and God will give him life for those that sin not to death. There is a sin to death: I do not say that he shall make request concerning this.
Revelation 19:20
And the beast was seized, and with him the false prophet that wrought the signs in his presence, with which he deceived those who received the mark of the beast, and who worshiped his image. The two were cast alive into the lake of fire that burns with brimstone.