Leviticus 18:6
None of you unto any relation of his flesh doth draw near to uncover nakedness; I am Jehovah.
Leviticus 18:7-19
The nakedness of thy father and the nakedness of thy mother thou dost not uncover, she is thy mother; thou dost not uncover her nakedness.
Leviticus 20:11-12
And a man who lieth with his father's wife -- the nakedness of his father he hath uncovered -- both of them are certainly put to death; their blood is on them.
Leviticus 20:17-21
'And a man who taketh his sister, a daughter of his father or daughter of his mother, and he hath seen her nakedness, and she seeth his nakedness: it is a shame; and they have been cut off before the eyes of the sons of their people; the nakedness of his sister he hath uncovered; his iniquity he beareth.