2 John 10

10If anyone comes to you, and does not bring this doctrine, do not be willing to receive him into the house, and do not speak a greeting to him.
1:10 Nor say to him, God speed you: This admonition is in general, to forewarn the faithful of the dangers which may arise from a familiarity with those who have prevaricated and gone from the true faith, and with such as teach false doctrine. But this is not forbidding a charity for all men, by which we ought to wish and pray for the eternal salvation of every one, even of our enemies.(Challoner)
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