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.
Jude 1:16
These people are gripers and complainers, living according to their own [evil] desires, whose mouths speak boastfully, and who show partiality [toward certain people] to gain some advantage.
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.
Revelation 19:20
But the beast was captured, along with the false prophet [See 16:13], who performed [supernatural] signs in his presence. [He had performed these signs] to deceive those who had received the mark of the beast and those who worshiped his statue. [See 13:15-16]. The beast and the false prophet were both thrown alive into the lake of fire that burns with sulphur.
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