3 John 1:9-10

I wrote unto the church; this was probably some church of which Gaius was.

Diotrephes, one who had received or usurped some office or authority in it, to so ill a purpose, as when he had no inclination to be hospitable himself to fellow Christians, prevented others from being so; and upon pretence of the little differences of these Jewish from the Gentile Christians, excluded them their communion.