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
Ambrosiaster
AD 400
This person was clearly deserving of death for his crime, but those who supported him were not innocent either. Commentary on Paul’s Epistles.