I was reading through the "Johns" last night, and ran across some passages I thought pertinent to this topic:
2 John 1:7-11
" 7because many leading astray did enter into the world, who are not confessing Jesus Christ coming in flesh; this one is he who is leading astray, and the antichrist.
8See to yourselves that ye may not lose the things that we wrought, but a full reward may receive;
9every one who is transgressing, and is not remaining in the teaching of the Christ, hath not God; he who is remaining in the teaching of the Christ, this one hath both the Father and the Son;
10if any one doth come unto you, and this teaching doth not bear, receive him not into the house, and say not to him, `Hail!'
11for he who is saying to him, `Hail,' hath fellowship with his evil works. "
Jude 1:8-16
"8In like manner, nevertheless, those dreaming also the flesh indeed do defile, and lordship they put away, and dignities they speak evil of,
9yet Michael, the chief messenger, when, with the devil contending, he was disputing about the body of Moses, did not dare to bring up an evil-speaking judgment, but said, `The Lord rebuke thee!'
10and these, as many things indeed as they have not known, they speak evil of; and as many things as naturally (as the irrational beasts) they understand, in these they are corrupted;
11wo to them! because in the way of Cain they did go on, and to the deceit of Balaam for reward they did rush, and in the gainsaying of Korah they did perish.
12These are in your love-feasts craggy rocks; feasting together with you, without fear shepherding themselves; clouds without water, by winds carried about; trees autumnal, without fruit, twice dead, rooted up;
13wild waves of a sea, foaming out their own shames; stars going astray, to whom the gloom of the darkness to the age hath been kept.
14And prophesy also to these did the seventh from Adam -- Enoch -- saying, `Lo, the Lord did come in His saintly myriads,
15to do judgment against all, and to convict all their impious ones, concerning all their works of impiety that they did impiously, and concerning all the stiff things that speak against Him did impious sinners.'
16These are murmurers, repiners; according to their desires walking, and their mouth doth speak great swellings, giving admiration to persons for the sake of profit;
17and ye, beloved, remember ye the sayings spoken before by the apostles of our Lord Jesus Christ:
18that they said to you, that in the last time there shall be scoffers, after their own desires of impieties going on,
19these are those setting themselves apart, natural men, the Spirit not having."