3 John 1 12
All the believers say that Demetrius is a good person. He obeys God's true message. That also shows clearly that he is a good person. We also say the same thing about him. You know very well that what we say about him is true.
Compare with other 3 random translations
YLT 3 John 1:12to Demetrius testimony hath been given by all, and by the truth itself, and we also — we do testify, and ye have known that our testimony is true.
NAS 3 John 1:12Demetrius has received a good testimony from everyone, and from the truth itself; and we testify too, and you know that our testimony is true.
NKJ 3 John 1:12Demetrius has a good testimony from all, and from the truth itself. And we also bear witness, and you know that our testimony is true.