Deuteronomy 22:30

A man is not to marry his father’s wife, so that he will not dishonor his father’s marriage bed.

Note Or uncover his father’s skirt

BSB · Berean Standard Bible
A man shall not take his father’s wife, nor discover his father’s skirt.
KJV · King James Version
A man shall not take his father’s wife, and shall not uncover his father’s skirt.
WEB · World English Bible
A man shall not take his father’s wife, and shall not uncover his father’s skirt.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

a man shall
This is to be understood as referring to the case of a stepmother. A man in his old age may have married a young woman, and on his dying, his son by another, or a former wife, may desire to espouse her; which is here forbidden.
Deuteronomy 27:20; Leviticus 18:8; Leviticus 20:11; 1 Corinthians 5:1, 13
discover
Ruth 3:9; Ezekiel 16:8