About these tares planted by Satan, who somehow make it into the church. They can be a source of great friction and wrangling by men against the truth. As posted above about these false teachers, they are treacherous and can speak smooth and oily words deceiving the simple minded.
I have known just a few in decades and they tear up the true sheep.
All the ones who leave, John the apostle declares were NOT of us, they are antichrists. That would be those who departed the faith in unbelief.
In other words, they were NOT OF GOD. The Holy Spirit was not living inside of them. They had never been converted. They were outwardly professing, Paul calls them false brethren.
1 John 2
Deceptions of the Last Hour
18 Little children, it is the last hour; and as you have heard that the[
d] Antichrist is coming, even now many antichrists have come, by which we know that it is the last hour. 19
They went out from us, but they were not of us; for if they had been of us, they would have continued with us; but they went out that they might be made manifest, that none of them were of us.
20 But you have an anointing from the Holy One, and you[
e] know all things. 21 I have not written to you because you do not know the truth, but because you know it, and that no lie is of the truth.
22 Who is a liar but he who denies that Jesus is the Christ? He is antichrist who denies the Father and the Son. 23 Whoever denies the Son does not have the Father either; he who acknowledges the Son has the Father also.
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2 Corinthians 11:25-27 New King James Version
25 Three times I was beaten with rods; once I was stoned; three times I was shipwrecked; a night and a day I have been in the deep; 26 in journeys often, in perils of waters, in perils of robbers, in perils of my own countrymen, in perils of the Gentiles, in perils in the city, in perils in the wilderness, in perils in the sea,
in perils among false brethren; 27 in weariness and toil, in sleeplessness often, in hunger and thirst, in fastings often, in cold and nakedness—
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They really are satanic.
And I suppose such also deceive other tares in churches, but God know those who are His, and His promise is they will continue on in genuine faith. Entire cult churches exist, as we well know.
Romans 16
Avoid Divisive Persons
17 Now I urge you, brethren, note those who cause divisions and offenses, contrary to the doctrine which you learned, and avoid them. 18
For those who are such do not serve our Lord [d]Jesus Christ, but their own belly, and by smooth words and flattering speech deceive the hearts of the simple. 19 For your obedience has become known to all. Therefore I am glad on your behalf; but I want you to be wise in what is good, and [
e]simple concerning evil. 20 And the God of peace will crush Satan under your feet shortly.
The grace of our Lord Jesus Christ
be with you. Amen.