It is reported commonly that there is fornication among you, and such fornication as is not so much as named among the Gentiles, that one should have his father's wife.
All Commentaries on 1 Corinthians 5:1 Go To 1 Corinthians 5
Cornelius a Lapide
SYNOPSIS OF THE CHAPTER
i. The Apostle proceeds from the schism of the Corinthians to deal with the scandal caused by incest among them: he blames them for allowing one living openly in incest to remain among them, and orders them to excommunicate him and hand him over to Satan.
ii. He bids them (ver6) purge out this and any other leaven of sin, in order that they may with purity celebrate the everlasting Passover, and so eat the unleavened bread of sincerity and truth.
iii. He orders them (ver9) not to mingle with Christians that are open sinners; but as for heathens and unbelievers, he says that they are not under the jurisdiction of him or of the Church.