1 John 2:1

My little children, these things I write to you, that you may not sin. Yet if any one has sinned, we have an advocate with the Father, Jesus Christ the Just One.

2 John 1:4

I rejoiced greatly, when I found some of your children walking in truth, as we received commandment from the Father.

3 John 1:3-4

For I rejoiced greatly, when the brethren came, and bore witness to your truth, even as you walk in truth.

Treasury of Scripture Knowledge

Summary

My son, if thine heart be wise, my heart shall rejoice, even mine.

Bible References

If

2 John 1:4
I rejoiced greatly, when I found some of your children walking in truth, as we received commandment from the Father.
3 John 1:3
For I rejoiced greatly, when the brethren came, and bore witness to your truth, even as you walk in truth.