John Chrysostom
Then he presents the reason why he does not command them to avoid association with such people from among the Gentiles. He proves that this is not only impossible, but also unnecessary.
“For what have I to do with judging those also who are outside?” (1 Cor 5:12). He calls Christians those within, and Gentiles those outside.
As he says elsewhere: “he must also have a good testimony from those who are outside” (1 Tim 3:7). He says the same in the epistle to the Thessalonians: “do not associate with him, that he may be ashamed.
Yet do not count him as an enemy, but admonish him as a brother” (2 Thess 3:14-15). There, however, he does not present the reason.
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Why? Because there he wished to encourage, but here not so. There the sin is not such as here. There he rebukes a lesser sin, idleness, but here fornication and other gravest sins.
For the same reason, he does not forbid one who associates with Gentiles to eat with them. We also act this way: we have complete care for children and brothers, but do not greatly concern ourselves with strangers.
But what then? Did Paul not care for those outside? He did care. But he taught them the commandments only when they accepted the preaching and submitted to the teaching of Christ.
Before they were converted, it would have been needless to speak of Christ's commandments to those who did not even know Christ. “Do you not judge those who are inside? But God judges those who are outside” (1 Cor 5:12-13).
Lest someone infer from his words, “what have I to do with judging those also who are outside?” that the Gentiles will remain unpunished, he points them to another judgment, a fearful one.
He says this in order to frighten those outside and at the same time to comfort his own. He also shows that this temporary punishment delivers from eternal and endless punishment.
As he said elsewhere: “when we are judged, we are chastened by the Lord, that we may not be condemned with the world” (1 Cor 11:32). And: “put away the evil from among yourselves” (Deut 17:7).
He borrowed the saying from the Old Testament in order, on the one hand, to suggest that they themselves would receive the greatest benefit, being freed as from a dangerous infection.
On the other hand, he wished to show that this was not an innovation. The ancient lawgiver had already commanded that such people be excommunicated.
Yet there it was stricter, and here more lenient. At this point one may rightly ask why the lawgiver there permitted the sinner to be executed and stoned, but here he does not.
Instead, he leads him to repentance. Why was it established one way there and another way here? For two reasons.
First, because those of the New Testament are called to a greater struggle, and therefore need greater condescension. Second, and more rightly, because a mitigation of punishment more readily disposes them to repentance and correction.
For those of the Old Testament, however, this would have led to greater corruption. If, even seeing the punishment of those before them, they remained in the same sins, then they would have hardened still more in such a state if some of them had not been punished.
For this reason, there the adulterer and murderer were immediately put to death. Here, if they cleanse themselves by repentance, they escape punishment.
Yet one can also find punishments in the New Testament stricter than in the Old. In the Old one can also find punishments lighter than in the New.
From this it is clear that the two Testaments are kindred and belong to one and the same lawgiver. In both, punishments sometimes follow the crime immediately, and sometimes after a long time.
Often this does not happen at all, but God is satisfied with repentance alone. Thus in the Old Testament David, who committed adultery and murder, was saved by repentance.
In the New, Ananias, who kept back a little from the price of the property, perished together with his wife. If in the Old there are more examples of severity, and in the New the opposite, the difference in this divine economy arises from the difference in persons.