Leviticus 15:21-23

If any of you touch her bed, you must wash your clothes and bathe yourself in water, and you will remain unclean until evening. If you touch any object she has sat on, you must wash your clothes and bathe yourself in water, and you will remain unclean until evening. This includes her bed or any other object she has sat on; you will be unclean until evening if you touch it.