3 John 1 10
So if I do visit, I will make it clear what he's been doing. He's been making malicious accusations against us. Not satisfied with doing that, he refuses to welcome any other brothers. He won't let anyone else welcome them either, and throws those who do so out of the church.
Compare with other 3 random translations
ASV 3 John 1:10Therefore, if I come, I will bring to remembrance his works which he doeth, prating against us with wicked words: and not content therewith, neither doth he himself receive the brethren, and them that would he forbiddeth and casteth them out of the church.
EAS 3 John 1:10So, when I arrive there myself, I will speak to the believers about this. I will tell them clearly about the bad things that Diotrephes is doing. He tells other people bad things about us that are not true. Even that is not enough for him. He himself refuses to welcome the believers who are visiting. He also stops anyone else who wants to welcome those visitors. Instead, he sends them away from the group of believers.
KJV 3 John 1:10Wherefore, if I come, I will remember his deeds which he doeth, prating against us with malicious words: and not content therewith, neither doth he himself receive the brethren, and forbiddeth them that would, and casteth them out of the church.