JOY 3 John 3-4

It gave me great joy when some believers came and testified about your faithfulness to the truth, telling how you continue to walk in it. I have no greater joy than to hear that my children are walking in the truth.

It game me great joy when some believers came and testified about your faithfulness to the truth 
3 John 5  Dear friend, you are faithful in what you are doing for the brothers and sisters, even though they are strangers to you.

telling how you continue to walk in it 
2 John 4  It has given me great joy to find some of your children walking in the truth, just as the Father commanded us.

I have no greater joy than to hear that my children 
1 John 2:1-2  My dear children, I write this to you so that you will not sin. But if anybody does sin, we have an advocate with the Father--Jesus Christ, the Righteous One. He is the atoning sacrifice for our sins, and not only for ours but also for the sins of the whole world.

are walking in the truth 
2 Timothy 4:1-4  In the presence of God and of Christ Jesus, who will judge the living and the dead, and in view of his appearing and his kingdom, I give you this charge: Preach the word; be prepared in season and out of season; correct, rebuke and encourage--with great patience and careful instruction. For the time will come when people will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear. They will turn their ears away from the truth and turn aside to myths.
2 Peter 1:12  So I will always remind you of these things, even though you know them and are firmly established in the truth you now have.
2 Peter 2:1-3  But there were also false prophets among the people, just as there will be false teachers among you. They will secretly introduce destructive heresies, even denying the sovereign Lord who bought them--bringing swift destruction on themselves. Many will follow their depraved conduct and will bring the way of truth into disrepute. In their greed these teachers will exploit you with fabricated stories. Their condemnation has long been hanging over them, and their destruction has not been sleeping.

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide.