II John 1:10

If there come any--as a teacher or brother. The Greek is indicative, not subjunctive; implying that such persons do actually come, and are sure to come; when any comes, as there will. True love is combined with hearty renunciation and separation from all that is false, whether persons or doctrines. receive him not . . . neither bid him God speed--This is not said of those who were always aliens from the Church, but of those who wish to be esteemed brethren, and subvert the true doctrine [GROTIUS]. The greeting salutation forbidden in the case of such a one is that usual among Christian brethren in those days, not a mere formality, but a token of Christian brotherhood.

Here, I. Upon due warning given concerning seducers, the apostle gives direction concerning the treatment of such. They are not to be entertained as the ministers of Christ. The Lord Christ will distinguish them from such, and so would he have his disciples. The direction is negative. 1. "Support them not: If there come any unto you, and bring not this doctrine (concerning Christ as the Son of God, the Messiah and anointed of God for our redemption and salvation), receive him not into your house." Possibly this lady was like Gaius, of whom we read in the next epistle, a generous housekeeper, and hospitable entertainer of travelling ministers and Christians. These deceivers might possibly expect the same reception with others, or with the best who came there (as the blind are often bold enough), but the apostle allows it not: "Do not welcome them into your family." Doubtless such may be relieved in their pressing necessities, but not encouraged for ill service. Deniers of the faith are destroyers of souls; and it is supposed that even ladies themselves should have good understanding in the affairs of religion. 2. "Bless not their enterprises: Neither bid him God speed. Attend not their service with your prayers and good wishes." Bad work should not be consecrated or recommended to the divine benediction. God will be no patron of falsehood, seduction, and sin. We ought to bid God speed to evangelical ministration; but the propagation of fatal error, if we cannot prevent, we must not dare to countenance. Then, II. Here is the reason of such direction, forbidding the support and patronage of the deceiver: For he that biddeth him God speed is partaker of his evil deeds. Favour and affection partake of the sin. We may be sharers in the iniquities of others. How judicious and…

1:10-11 Believers should not invite that person, who does not teach the truth about Christ, into their homes. The early churches met in homes (see Acts 2:46; 5:42; 8:3; 12:5, 12; Col 4:15; Phlm 1:2), so this could refer to inviting false teachers to a meeting of the church. It could also refer to giving any form of hospitality to false teachers, which would help their mission. The only way to deal with them was to not accept them into the fellowship.