Leviticus 20:17-21  New English Translation

¹⁷ “‘If a man has marital relations with^[a] his sister, whether the daughter of his father or of his mother, so that he sees her nakedness and she sees his nakedness, it is a disgrace. They must be cut off in the sight of the children of their people.^[b] He has exposed his sister’s nakedness; he will bear his punishment for iniquity.^{[c] 18} If a man goes to bed^[d] with a menstruating woman and uncovers her nakedness, he has laid bare her fountain of blood and she has exposed the fountain of her blood, so both of them^[e] must be cut off from the midst of their people. ¹⁹ You must not expose the nakedness of your mother’s sister or your father’s sister, for such a person has exposed his own close relative.^[f] They must bear their punishment for iniquity.^{[g] 20} If a man goes to bed^[h] with his aunt, he has exposed his uncle’s nakedness; they must bear responsibility for their sin, they will die childless. ²¹ If a man has marital relations with^[i] his brother’s wife, it is indecency. He has exposed his brother’s nakedness;^[j] they will be childless.