Ver. 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.
Related Commentaries of 3 John 1:9
3 John 1:9
9 I wrote unto the church: but Diotrephes, who loveth to have the preeminence among them, receiveth us not.