Leviticus 15:19-23

19“If a woman has a discharge, and her discharge from her body is blood, she shall be in her niddah seven days. And whoever touches her will be unclean until the evening.

20Everything that she lies on in her niddah will become unclean. Also everything that she sits on will become unclean.

21Whoever touches her bed is to wash his clothes and bathe himself in water, and be unclean until the evening.

22Whoever touches anything that she sits on is to wash his clothes and bathe himself in water, and be unclean until the evening.

23If it is on the bed or on anything where she sits, when he touches it, he will be unclean until the evening.