Leviticus 20:18 in the World English Bible
“‘If a man lies with a woman having her monthly period, and uncovers her nakedness, he has made her fountain naked, and she has uncovered the fountain of her blood. Both of them shall be cut off from among their people.
Context
17 And if a man shall take his sister, his father’s daughter, or his mother’s daughter, and see her nakedness, and she see his nakedness; it is a wicked thing; and they shall be cut off in the sight of their people: he hath uncovered his sister’s nakedness; he shall bear his iniquity.
18 And if a man shall lie with a woman having her sickness, and shall uncover her nakedness; he hath discovered her fountain, and she hath uncovered the fountain of her blood: and both of them shall be cut off from among their people.
19 And thou shalt not uncover the nakedness of thy mother’s sister, nor of thy father’s sister: for he uncovereth his near kin: they shall bear their iniquity.