Commentaries
5:9-13 Christians are to avoid familiar converse with all who disgrace the Christian name. Such are only fit companions for their brethren in sin, and to such company they should be left, whenever it is possible to do so. Alas, that there are many called Christians, whose conversation is more dangerous than that of heathens!
12. what have I to do—You might have easily understood that my concern is not with unbelievers outside the Church, but that I referred to those within it.
also—Implying, Those within give me enough to do without those outside.
do not ye, &c.—Ye judge your fellow citizens, not strangers: much more should I [Bengel]. Rather, Is it not your duty to judge them that are within? God shall judge them that are without: do you look at home [Grotius]. God is the Judge of the salvation of the heathen, not we (Ro 2:12-16). Paul here gives an anticipatory censure of their going to law with saints before heathen tribunals, instead of judging such causes among themselves within.