10 But I had not in mind the sinners who are outside the church, or those who have a desire for and take the property of others, or those who give worship to images; for it is not possible to keep away from such people without going out of the world completely:
Matthew Henry's Commentary on 1 Corinthians 5:10
Commentary on 1 Corinthians 5:9-13
(Read 1 Corinthians 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!