It is actually reported that there is sexual immorality among you, and of a kind that is intolerable even among pagans: A man has his father’s wife.
KJV
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.
ASV
It is actually reported that there is fornication among you, and such fornication as is not even among the Gentiles, that one of you hath his father’s wife.