Not to have intercourse with a woman, in her menstrual period (ibid. 18:19)

Leviticus 18:19

KJV

Also thou shalt not approach unto a woman to uncover her nakedness, as long as she is put apart for her uncleanness.

ASV

And thou shalt not approach unto a woman to uncover her nakedness, as long as she is impure by her uncleanness.

WEB

“‘You shall not approach a woman to uncover her nakedness, as long as she is impure by her uncleanness.

JPS

And thou shalt not approach unto a woman to uncover her nakedness, as long as she is impure by her uncleanness.