I was very glad when the brothers arrived, and when they offered testimony to the truth in you, that you are walking in the truth
Other versions
King James Version
For I rejoiced greatly, when the brethren came and testified of the truth that is in thee, even as thou walkest in the truth.English Standard Version
For I rejoiced greatly when the brothers came and testified to your truth, as indeed you are walking in the truth.New International Version
It gave me great joy to have some brothers come and tell about your faithfulness to the truth and how you continue to walk in the truth.