1 John 2:19

19 These people left our churches, but they never really belonged with us; otherwise they would have stayed with us. When they left, it proved that they did not belong with us.

1 John 2:19 In-Context

17 And this world is fading away, along with everything that people crave. But anyone who does what pleases God will live forever.
18 Dear children, the last hour is here. You have heard that the Antichrist is coming, and already many such antichrists have appeared. From this we know that the last hour has come.
19 These people left our churches, but they never really belonged with us; otherwise they would have stayed with us. When they left, it proved that they did not belong with us.
20 But you are not like that, for the Holy One has given you his Spirit, and all of you know the truth.
21 So I am writing to you not because you don’t know the truth but because you know the difference between truth and lies.
Holy Bible. New Living Translation copyright© 1996, 2004, 2007, 2013 by Tyndale House Foundation. Used by permission of Tyndale House Publishers Inc., Carol Stream, Illinois 60188. All rights reserved.