Lev Leviticus3. Mooseksen, chapterluku Book of LeviticusKolmas Mooseksen kirja, chapterluku 20

If a man lies with a menstruating woman and has sexual relations with her,(d)20:18 Literally uncovers her nakedness; similarly in verse 19 he has exposed the source of her flow, and she has uncovered the source of her blood. Both of them must be cut off from among their people.