1 Corinthians 5:1

It has actually been reported [to me] that there is a case of sexual immorality among you that is unheard of, even among the [unconverted] Gentiles. One of you is having sex with his stepmother.

1 Corinthians 5:13

For what business is it of mine to judge outsiders? [i.e., non-Christians]; God judges them. But should you not judge those people who are inside? [i.e., Christians]. [So], remove the evil person from your fellowship [See Deut. 17:7].

Treasury of Scripture Knowledge

Summary

A man shall not take his father's wife, nor discover his father's skirt.

A man shall

Bible References

A man shall

1 Corinthians 5:1
It has actually been reported [to me] that there is a case of sexual immorality among you that is unheard of, even among the [unconverted] Gentiles. One of you is having sex with his stepmother.