利未记 20:18

妇人有月经，若与她同房，露了她的下体，就是露了妇人的血源，妇人也露了自己的血源，二人必从民中剪除。

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.