1 John 2:19

2:19 They went out from us, but they did not really belong to us, because if they had belonged to us, they would have remained with us. But they went out from us to demonstrate that all of them do not belong to us.

1 John 2:21

2:21 I have not written to you that you do not know the truth, but that you do know it, and that no lie is of the truth.