1 John 2:18-19

18Children, it is the last hour. Just as you heard that the anti-messiah is coming, even now many anti-messiahs have come—by this we know that it is the last hour.

19They left us, but they didn’t really belong to us. If they had belonged to us, they would have remained with us. But they left us so it became clear that none of them belongs to us.