‘If any one comes to you, and does not bring this teaching, do not receive him into your house, and give him no greeting, for he who gives him greeting partakes in his evil works.'
The matter has in fact become so serious that those who are clearly deceivers in this way, and do not teach this truth, must not be invited into their house. He must not be welcomed in the church as a brother. He must not be greeted as a brother. To do either would be to be participants with such in their evil behaviour.
The emphasis here is on not welcoming false teachers in such a way as to give some the impression that they are of the truth. By doing so they would be assisting their deception. Compare Titus 3:10. It does not mean that they should not be ‘loved' when in need, only that they should not be welcomed as though they were true brethren.