3 John 1:9-10

9I have already written something to the group of believers. But Diotrephes refuses to accept our authority. He really wants to be the only leader among them.

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.