Leviticus 15:22-24

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^21-23 and any person who touches her bed or her cushion or anything else she sits on must wash his clothes and bathe in water. He will remain impure until dusk. ²⁴ If a man has sexual relations with a woman during her menstrual period and her menstrual blood gets on him, he will be impure for seven days, and any bed he lies down upon will be impure as well.