Leviticus 20:18

And whatever man shall lie with a woman that is set apart [for a flux], and shall uncover her nakedness, he has uncovered her fountain, and she has uncovered the flux of her blood: they shall both be destroyed from among their generation.

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.

“‘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.