Leviticus 15:19-23

19When a woman has a discharge consisting of blood from her body, she will be unclean due to her menstruation for seven days, and anyone who touches her will be unclean until evening. 20Anything on which she lies or sits during her menstruation will be unclean, 21and anyone who touches her bed must wash his clothes and bathe with water, and he will be unclean until evening.

22Whoever touches any furniture on which she was sitting must wash his clothes and bathe with water, and he will be unclean until evening. 23And whether it is a bed or furniture on which she was sitting, whoever touches it will be unclean until evening.