Leviticus 15:19, 24
When a woman has a discharge consisting of blood from her body, for seven days she will be unclean due to menstruation, and anyone who touches her will be unclean until evening. . . .

Leviticus 20:18
If a man lies with a menstruating woman and has sexual relations with her, 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 their people.

Ezekiel 18:6
He does not eat at the mountain or look to the idols of the house of Israel. He does not defile his neighbor's wife or approach a woman during her period.

Ezekiel 22:10
In you they have uncovered the nakedness of their fathers; in you they violate women during their impurity.