'Us' in the Bible

I wrote something to the church, but Diotrephes, who wants to be first [among] them, does not acknowledge us.

Therefore, if I come, I will call attention to {the deeds he is doing}, disparaging us with evil words. And not being content with these, he does not receive the brothers himself, and he hinders those wanting [to do so] and throws [them] out of the church.