If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed:
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Clement Of Alexandria
AD 215
He forbids us to salute such, and to receive them to our hospitality. For this is not harsh in the case of a man of this sort. But he admonishes them neither to confer nor dispute with such as are not able to handle divine things with intelligence, lest through them they be seduced from the doctrine of truth, influenced by plausible reasons. Now, I think that we are not even to pray with such, because in the prayer which is made at home, after rising from prayer, the salutation of joy is also the token of peace.
lf any one come to you, and bring not this doctrine, &c. S. John in this place not only advises, as some think, but also commands Electa and all the rest of the faithful not to receive to hospitality, nor say Hail, to any one who brings another doctrine, i.e. one which is contrary to the orthodox faith of Christ. For he who saith hail to such is partaker of their evil deeds. That Isaiah , he seems to favour and applaud the heretical teacher.
Observe, not only by human and canon laws, as since the time of S. John they have been enacted by Pontiffs and Councils, heretics are to be avoided in three cases. The first Isaiah , when there is danger lest you or yours should be perverted by them, which is a thing which ordinarily happens. For, as S. Paul saith, "Their word doth creep as doth a cancer." ( 2 Timothy 2:17.)
2d. When, by receiving, you would seem to favour his heresy, and tacitly profess or encourage it. As, for example, if you were to receive to your house and table a recognised...
Said: John the apostle laid it down in his epistle, saying: "If any one come unto you, and have not the doctrine of Christ, receive him not into your house, and say not to him, Hail. For he that saith to him, Hail, partakes with his evil deeds."
Nor say to him, Hail; or peace be to you, God speed you, all hail; or use any form of saluting him, as you would a friend, much less receive or entertain him in your house: this admonition is in general to forewarn persons of the dangers which may arise from a familiarity with heretics, and such as teach evil doctrine. But by this is not forbidden civility, kindness, and a sincere charity for all men, by which we ought to wish and pray for the eternal salvation of every one. I translate Ave by peace be to you, because this was the usual salutation among the Jews, and in those times, as we see in Luke 24 and John 20.
And John, the disciple of the Lord, has intensified their condemnation, when he desires us not even to address to them the salutation of "good-speed; "for, says he, "He that bids them be of good-speed is a partaker with their evil deeds; "
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.