5:13 Them that are outside God judgeth. The unconverted are left in the hands of God. He will judge them according to their deeds. We are not asked to seek to inflict punishment on them by shunning them, but rather to go to them in the love of Christ to try to lead them to repentance.
Therefore put away from among yourselves that wicked person. A summary order to execute discipline upon the incestuous offender, an order that we know from the second letter was obeyed.
5:13 Them that are without God will judge - The passing sentence on these he hath reserved to himself. And ye will take away that wicked person - This properly belongs to you.
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!
