I wrote unto you in an epistle not to company with fornicators:
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Cornelius a Lapide
I wrote unto you. In ver2of this chapter. So Theodoret and Chrysostom. But S. Thomas, Lyranus, Cajetan think that S. Paul wrote this in another former epistle which has perished.
Not to company with fornicators . . . for then must ye needs go out of the world. When I bade you have no fellowship with fornicators I did not mean what you were to avoid fornicating pagans, for then you would have to go out of the world, for the whole world is full of pagans, who are either fornicators, or covetous, or idolaters; but if any one who is a brother, says S. Ambrose, if any one who is a Christian, is publicly spoken ill of as a fornicator, then avoid him.