1 John 2:19
They went away from us, but they were not of us. For, if they had been of us, they would have abode with us; but they went away, that they might be made manifest that they were not of us.
2 Peter 2:20-21
Now, if, having fled away from the pollutions of the world, through the knowledge of the Lord and Saviour Jesus Christ, and being again entangled, they are overcome by them; their last condition is worse than the first.
Jude 1:1
Jude, a servant of Jesus Christ, and brother of James, to them who are sanctified by God the Father, and to the preserved by Jesus Christ, to the called:
Jude 1:19
These be they who separate themselves, sensual, not having the Spirit.