Acts 20:30

“Now when they fall, they will be granted a little help, and many will join with them in intrigue.

for I have five brothers—in order that he may warn them, so that they will not also come to this place of torment.’

For such men are false apostles, deceitful workers, disguising themselves as apostles of Christ.

They went out from us, but they were not really of us; for if they were of us, they would have remained with us; but they went out, so that it would be manifested that they all are not of us.