John 15:3-4

You people are already 'clean' [i.e., have been pruned of undesirable traits] because of [obedience to] the teaching I have given you.

1 John 2:19

These antichrists left our group [i.e., withdrew their fellowship from us], but they were not [really a part] of us, for if they had been, they would have continued [to participate] with us. But, by their leaving us, it proved that none of them were [really] a part of our group [after all].

Treasury of Scripture Knowledge

Summary

The ear that heareth the reproof of life abideth among the wise.

Bible References

Abideth

John 15:3
You people are already 'clean' [i.e., have been pruned of undesirable traits] because of [obedience to] the teaching I have given you.
1 John 2:19
These antichrists left our group [i.e., withdrew their fellowship from us], but they were not [really a part] of us, for if they had been, they would have continued [to participate] with us. But, by their leaving us, it proved that none of them were [really] a part of our group [after all].