Commentaries:
Robertson's Word Pictures (NT)
If any one cometh and bringeth not (ei tiv erxetai kai ou ferei). Condition of first class with ei and two present indicatives (erxetai, ferei).
This teaching (tauthn thn didaxhn). This teaching of Christ of verse II John 1:9, which is the standard by which to test Gnostic deceivers (verse II John 1:7). John does not refer to entertaining strangers (Hebrews 13:2; I Timothy 5:10), but to the deceiving propagandists who were carrying dissension and danger with them.
Receive him not (mh lambanete auton). Present active imperative with mh. For lambanw in this sense see John 1:12; John 6:21; John 13:20.
Into your house (eiv oikian). Definite without the article like our at home, to town.
Give him no greeting (xairein autw mh legete). "Say not farewell to him." Apparently xairein here (present active infinitive, object of legete present active imperative with negative mh) is used of farewell as in II Corinthians 13:11, though usually in the N.T. (Acts 15:23; Acts 23:26; James 1:1) of the salutation. But here the point turns on the stranger bringing into the house (or trying to do so) his heretical and harmful teaching which seems to be after the salutation is over. The usual greeting to a house is given in Luke 10:5. On the other hand, if xairein means greeting, not farewell, here, it can very well be understood of the peril of allowing these Gnostic propagandists to spread their pernicious teachings (cf. Mormons or Bolshevists) in home and church (usually meeting in the home). This is assuming that the men were known and not mere strangers.
Other Robertson's Word Pictures (NT) entries containing 2 John 1:10:
James 1:1
3 John 1:5
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