Matthew 7:15
Beware of false Teachers--men who come to you in the guise of sheep, but at heart they are ravenous wolves.
Romans 16:18
For such persons are not serving Christ, our Master, but are slaves to their own appetites; and, by their smooth words and flattery, they deceive simple-minded people.
2 Corinthians 11:13-15
Men of this stamp are false apostles, treacherous workers, disguising themselves as Apostles of Christ!
Galatians 2:4
But, on account of the false Brothers who had stolen in, the men who had crept in to spy upon the liberty which we have through union with Christ Jesus, in order to bring us back to slavery--
Ephesians 4:14
Then we shall no longer be like infants, tossed backward and forward, blown about by every breath of human teaching, through the trickery and the craftiness of men, towards the snares of error;
2 Thessalonians 2:9-10
For at the Coming of the Lord there will be great activity on the part of Satan, in the form of all kinds of deceptive miracles, signs, and marvels, as well as of wicked attempts to delude--
1 Timothy 4:1-2
But the Spirit distinctly says that in later times there will be some who will fall away from the Faith, and devote their attention to misleading spirits, and to the teaching of demons,
Titus 1:10-12
There are, indeed, many unruly persons--great talkers who deceive themselves, principally converts from Judaism,
Revelation 13:11-14
Then I saw, rising out of the earth, another wild Beast. It had two horns like those of a lamb, and its voice was like a dragon's.
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.'