Romans 16:18
For such men are not serving our Lord Christ but their own [unspiritual] appetites. They are deceiving the minds of innocent people by their smooth talk and flattering words.
2 Corinthians 11:13-15
For such men are false apostles; they are deceitful workers, who disguise themselves as [true] apostles of Christ.
Philippians 3:19
Their [ultimate] end is [spiritual] destruction; their god is their appetite; they boast of what they ought to be ashamed of, and they [constantly] think about worldly things.
2 Thessalonians 2:8-11
And then the lawless person [See verse 3] will be revealed, the one whom the Lord Jesus will destroy with the breath of His mouth and bring to an end by the brilliant appearance of His presence [i.e., at His second coming].
2 Peter 2:1-3
But just as there were false prophets among the people before, there will also be false teachers among you [Christians]. They will privately teach harmful doctrines that destroy people [spiritually], by even denying [that Jesus is] the Master, [and thereby] destroying themselves quickly.
2 Peter 2:13-19
They suffer wrong themselves for doing wrong to other people. They consider it [especially] pleasurable to carry on their drunken revellings, [even] during the daytime. They become blots and blemishes [i.e., like spoiled food] in your fellowship meal, as they revel in their deceitful behavior.
1 John 4:1
Loved ones, do not believe [the message of] every spirit [i.e., every person claiming to be a teacher], but test the spirits [i.e., require proof that they and their message are genuine] to see whether they represent God [or not], because many false prophets have begun circulating throughout the world.
Revelation 16:13-14
And I saw three evil spirits that looked like frogs; [one was] coming out of the mouth of the dragon, [one] out of the mouth of the beast, and [one] out of the mouth of the false prophet.