Leviticus 18:6
" '{None} [of] you shall approach anyone [who is] {his close relative} to expose nakedness; I [am] Yahweh.
Leviticus 18:7-19
You must not expose your father's nakedness or your mother's nakedness--she [is] your mother; you must not expose her nakedness.
Leviticus 20:11-12
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.
Leviticus 20:17-21
" 'As for a man who takes his sister, his father's daughter or his mother's daughter, and he sees her nakedness and she herself sees his nakedness, it [is] a disgrace, and they shall be cut off {before} the eyes of {their people}; he has exposed his sister's nakedness--he must bear his guilt.