10 not at all [meaning] with the fornicators of this world, or with the covetous and extortioners, or with idolaters; for then must ye needs go out of the world:

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!