Vayikra 20:17-19

Orthodox Jewish Bible

¹⁷ And if an ish shall take his achot, the bat of his av (father), or the bat of his em (mother), and see her nakedness, and she see his nakedness; it is a disgrace; and they shall be cut off in the sight of their Bnei Am; he hath uncovered the nakedness of his achot (sister); he shall bear his iniquity.

¹⁸ And if an ish shall lie with an isha during her davah (menstruous unwellness), and shall uncover her nakedness, he hath made bare her mekor (source), and she hath uncovered the source of her dahm; and both of them shall be cut off from among their people.

¹⁹ And thou shalt not uncover the nakedness of thy mother’s achot (sister), nor of thy father’s achot (sister); for he uncovereth (i.e., incestuously dishonored) his near kin; they shall bear their iniquity.