Leviticus 20:11
As for a man who lies with his father's wife, he has exposed his father's nakedness; both of them shall be put to death--their blood [is] on them.
Deuteronomy 27:20
'Cursed be the one who lies with the wife of his father, because {he has dishonored his father's bed}.' And all the people shall say, 'Amen.'
Deuteronomy 27:23
'Cursed be the one who lies with his mother-in-law.' And all the people shall say, 'Amen.'
Leviticus 18:7-8
You must not expose your father's nakedness or your mother's nakedness--she [is] your mother; you must not expose her nakedness.
Amos 2:7
Those who trample the heads of the powerless into the dust of the ground and turn aside the way of the destitute, a man and his father {have sexual relations with} the same girl, so that [they] profane my holy name.
1 Corinthians 5:1
It is reported everywhere [that there] is sexual immorality among you, and sexual immorality of such a kind which [does] not [even exist] among the Gentiles, so that someone has the wife of [his] father.